Among Hyderabad Central University (HCU) and GITAM University Vizag, it is suggested that you go for Hyderabad Central University. 

• Studying at Hyderabad Central University will be a much safer option, considering academics and placements.
• Being a central university and entertaining politically affiliated student organizations on campus catches the attention of national media. 
• The faculty is much more interactive here, and are more than willing to stay back after work if guidance is required.
• GITAM has better hostels than Hyderabad Central University. 
• HCU has much lower fees compared to GITAM.

Lastly, placements majorly depend on the individual and not on the institution. So, if you work hard no matter the institution, you will definitely secure a good placement offer from a reputed company.