I wont recommend biotech at either nsut or DTU ....cuz it will certainly change ur track...u have fierce interest in coding ..go for cse/it...cuz most of the good companies will not allow biotech student to sit in the placement....and with ur rank i can say that..most probably u can get mechanical too...so fill the choice till mechanical.....biotech changes the path completely.

NSTU, DTU definitely have an edge over uptu colleges no matter how good the college is. Moreover the colleges have location advantage as they are in delhi also the coding culture their is very good it does not matter which branch you are in you can always enhance your coding skills as coding atmosphere is great there many students which top ranks in jee join DTU/nsut the only advantage you will get in cse from uptu college is that you will have a cse degree that's it but before proceeding for dtu/nsut make sure that many companies do not allow biotech students to sit in their placements so choose wisely.