Hi
It depends on which course you would prefer from the two. Also course preference must be on a upper pedestal than college preference in such a selection. Hence it's all your choice which course you would like to spend 3-4 years with.
However in the retrospect, nit surathkal has got a brilliant placement record and a nice faculty and alumni than that of bits. Also, you may change your course after a semester if you wish to.
In the end it's all your decision and you need to be accountable to every step you take.
You can try compare the colleges you can get with your mains and bits ranks through this link
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer
Good luck

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