See you are so much confused about which college should you join but you don't need to worry. 

I would suggest that first you should make clear which way you wanna go . JEE or CUSAT.

For JEE you gave three options , nit Trichy, nit Surathkal and nit Warangal. These three are obviously better than the CUSAT college of you get a seat in it. 

For me nit Trichy will be best then Warangal and then Surathkal.

All the best.

Thank you.