Which college should I choose for a B.Arch. under the NIT/SPA?

Firstly a hearty congratulations to you for scoring a good rank in JEE Main. However, it is quite difficult to get a seat at SPA Delhi in this rank. The 2nd best option can be SPA Bhopal. Moreover, SPA Vijayawada is relatively newer and cannot be trusted.

I have friends studying at both Bhopal and Vijayawada, from what I've heard, Bhopal is a better option. SPAs are purely design institutes and thus the exposure would be greater. 

Since your chances at SPA D are quite on edge, you can instead look for the following colleges in order of preference: 

NIT Nagpur> NIT Bhopal> SPA Bhopal> NIT Jaipur> SPA Vijayawada and so on.

If you want to go for NITs, choose the one with better infrastructure, weather, and a diverse crowd. There are many other good institutes as well but do your proper research and take the right decision for yourself.