Quoting from an old post by a brother,
The Strongest?
 There are many reasons why a scholar may deem an opinion ‘the  strongest.’ In fact there are so many reasons, that it is quite possible  (and has happened) that one scholar will deem an opinion stronger based  on one criterion, whilst another scholar will deem another opinion  stronger based on another criterion. It helps to be aware of the fact  that the basis of weighing an opinion is an in-depth compound process,  the explanation of which goes beyond the scope of this article. However  those interested may refer to any good books on 
Usūl al-Fiqh (principles of jurisprudence).
 Based on this, it is a 
mistake of students to understand the statement of their sheikh when he says ‘
this position is the strongest’ to mean 
‘all other opinions are weak or invalid.’  Despite the obvious fallacy in this way of thinking, it also shows a  lack of understanding of what it effectively means when a scholar makes  such a pronouncement. They are simply exposing their understanding of  which position they feel is strongest, their personal stance, which is  subjective. It is important to limit their perception and findings as  such and not inflate them and exaggerate it as if it is ‘
the objectively strongest opinion,’ which in all honesty, none but Allāh knows. Indeed this is with all aspects of 
fiqh.
 
“The Strongest” – But Why?
 When one finds scholars at odds with each other over which opinion in  a given matter is the strongest, and this is common, it may help to  enquire about the reason as to 
why a position is ‘the  strongest’, if the scholar or student of knowledge has not already  explained so. After several enquiries one will notice that differences  of opinion hardly arise due to one side basing their legal understanding  on a 
hadīth whilst the other bases it on whim or mere opinion, as is suggested in some circles. Instead it is the understanding or 
fahm  of the text that leads to such differences. This fact should inform the  attitude of the average Muslim or student of knowledge, and help avoid  the attitude of a fanatic when approaching such matters. The assumption  should be that a valid reason for divergence exists, and not that one  side has made a mistake, for such an approach deprives the one who  adopts it of valuable knowledge and thus slows down their development.
 This is backed up by many examples from the lives of the companions  (may Allah be pleased with them all) as well as in the discussions that  took place between later jurists, for example the incident of praying  salāt al-`Asr at Banī Quraidha
[1].
 
The incident of praying Salat al-`Asr at Banī Quraidha
 The Prophet ﷺ had sent a group of companions and instructed, “No one  should pray salat al-`Asr except in (the vicinity of) Banī Quraidha.”
 Banī Quraidha was a tribe living in Medina. The only problem was that  the time for the `Asr prayers had almost expired before the group  reached the vicinity of Banī Quradha. Thus, they found themselves  divided into supporters of two different opinions, one group strongly  believed that they should pray only once they had reached their  destination, even if that meant they would miss the time of `Asr. The  other group prayed on the way and thus prayed al-`Asr in its time,  though seemingly at odds with the Prophet’s ﷺ instruction.
 Both groups of companions in this case made an 
Ijtihād or an  attempt to arrive at a sound decision within the confines of the  revealed text and legislation. The rationale behind the first group was  that the Prophet’s ﷺ instruction was clear in asking everybody to 
pray at  Banī Qurayẓa upon arrival, thus they gave preference to the literal and  specific command to the situation at hand superseding the other  commands to pray `Asr on time.
 The rationale of the second opinion, however, was that the Prophet’s ﷺ 
purpose (
maqsid) of the order was to ask the group to hasten to Banī Qurayẓa 
before `Asr to pray punctually, rather than actually 
intending  to postpone prayers until after its due time. Their reason for this was  that they put into context this specific command within the context of  other commandments concerning praying `Asr on time and thus preferred to  take the view of what they believed was intended, for it was known very  clearly that the prayers had fixed times.
 The case was related to the Prophet ﷺ and he did not censure any of  the parties. This meant that he approved both methods, for the Prophet ﷺ  did not remain silent on falsehood. And thus his silent approvals are  part of his 
Sunnah, and both parties were correct in their attempts to arrive at the truth.
 However, did he also approve the result of their 
Ijtihād?  This is disputed. And this dispute continued centuries later, when  scholars came and commented on which opinion was ‘the strongest’.  The  famous scholar of the literalist school, Muḥammad ibn Ḥazmal-Ẓāhiri  supported the group that prayed salat al-`Asr after they reached Banī  Qurayẓa, as the Prophet ﷺ had said, and said this was the stronger  opinion even if it was after midnight. This was in harmony with his  literalist approach.
 However the jurist Ibn al-Qayyim al-Jawziyya asserted that it was  those who prayed on the way that were correct. Ibn al-Qayyim had a more  holistic approach, and so his criteria of judging which opinion is  stonger differed from Ibn Ḥazm (may Allāh shower both scholars with his  mercy and grace).
 Thus what the strongest position is at times depends on which scholar  one learns from. It is important for adherents of both views to not  take the statements of each scholar out of the realm of ‘human  understanding’ (
fiqh) no matter how convinced they may be, and endow them with ultimate divine status.
 There is however an exception to this. Sometimes there are opinions, which are deemed aberrant (
shādh)  by the overwhelming majority of jurists. Such opinions are left to  their respective scholars without being adopted in practice.  Unfortunately however, even this concept of an opinion being 
shādh  is also abused and used in a polemical manner to discredit the opinions  of others, and therefore care must be taken to verify whether something  being claimed as 
shādh, is actually so.
 Lastly, though it may seem tempting at first to students of knowledge  to be overly ambitious and pass judgements as to which opinion they  find strong and which they do not, it is important to remember that such  an endeavour is a strenuous process, which one who knows the severity  of, will never belittle. We learn so that our chests may expand to  accommodate more wisdom and jewels from our intellectual heritage, and  so we can embody this higher understanding in our practice. It is not so  that we become more restricted and confined to one set of opinions or  another. And if our attitude and morals do not embody such learning,  then the question needs to be asked, what is the point of our learning?