Adhering to a madhhab when one knows that other madhhabs have stronger evidence
Question

                What is the ruling on adhering to a madhhab when it is clear that other madhhabs have stronger evidence)?
Praise be to Allah.
    If a person adheres to a particular madhhab, then he finds 
    out that it is likely that another madhhab has stronger evidence, this is a 
    serious error. It is not permissible to do that. This is included in what is 
    mentioned in the aayah (interpretation of the meaning): 
“They (Jews and 
    Christians) took their rabbis and their monks to be their lords besides 
    Allaah (by obeying them in things which they made lawful or unlawful 
    according to their own desires without being ordered by Allaah), and (they 
    also took as their Lord) Messiah, son of Maryam (Mary), while they (Jews and 
    Christians) were commanded [in the Tawraat (Torah) and the Injeel (Gospel)] 
    to worship none but One Ilaah (God — Allaah) Laa ilaaha illa Huwa (none has 
    the right to be worshipped but He). Praise and glory be to Him (far above is 
    He) from having the partners they associate (with Him)”

    [al-Tawbah 9:31]

    This implies turning away from the guidance of Allaah and the 
    Sunnah of His Messenger  (peace and blessings of Allaah be upon him).