The best college for b.tech ECE among PVP Siddhartha,gudlavalleru college & RVR & JC college.
All the colleges are same in terms of ratings. If you want to prefer one you can go for RVR and JC college as it has better placements.
You can also compare all the colleges from the given below link
RVR and JC College Ratings and Reviews
http://www.engineering.careers360.com/gudlavalleru-engineering-college-gudlavalleru/reviews
http://www.engineering.careers360.com/prasad-v-potluri-siddhartha-institute-technology-vijaywada/reviews