Both Vignan College Guntur and GRIET Hyderabad are good at their repsective places. Both provides good ambience for studies. Both have good infrastructure. The placement cell is good for both of them. Moreover,getting placement depends on your individual calibre,like if you have the required skills then,you will get placed. Talk to the students of those colleges and visit the campus and just see,whether you can adjust over there.
Hope this helps.