As choosing a college totally depends on you but I'll advise you to join iiit Vadodara. IIIT Vadodara has much better environment than Nirma University. The students at iiit Vadodara starts advanced coding and participate in coding competitions from beginning and thus makes the environment great for study. The placement scenario is also great most of the companies visit just for iiit tag.
Check details about iiit Vadodara
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here you can compare any two colleges to know which college is best.
I hope this will help you out