Hazrat Moulana Ashraf Ali Thanwi (rahmatullahi ‘alaih) once mentioned the following:
In regard to the Ahlullah (the special and pious servants of Allah Ta‘ala), it is not correct for one to judge between them as to who is greater in rank than the other. Judging between them in this manner is disrespectful.
The reason is that Allah Ta‘ala alone has knowledge of whose position is higher than the others, and who is more accepted in His sight. Hence, one should respect all and maintain a high opinion of all the Ahlullah (the special and pious servants of Allah Ta‘ala).
(Malfoozaat Hakeemul Ummat 23/301)
Source: Ihyaauddeen.co.za