Can anyone please recommend who will be better for CA classes between Santosh sir and Dipin sir?I think you should go for Dipin sir, I have taken classes of both and I found Dipin sir better. Santosh sir gives too many handouts, you will feel that you have studied a lot but it's really hard to revise.
Dipin Sir - pros - crisp handouts of 1-2 pages, value added material, easy to revise, his notes are really useful for mains (mainly GS2-GS3), for prelims his notes are okayish, but again they are short and easy to revise. (but reading too much CA for prelims is futile these days, but no one knows when can UPSC start asking CA, so at least do CA from one source.)
cons - cancel classes often, costly as compared to Santosh sir
Santosh sir - pros - teaches way too much (this is con as well), friendly, his CA notes for SnT and environment are top notch, less costly (he even allow 2 login per course, so you can also buy his course along with someone else)
cons - mainly prelims oriented classes (he teaches approx 5 months only for prelims), at the end of his classes you will have approx 2k pages of current affairs + some static topic as well
My opinion - go for Dipin Sir and refer Santosh sir notes selectively at time of prelims (easily available in market as well as on his telegram channel)
Thank you sir!!