It is better to go for B.Tech at Tezpur University (TU) than Assam Engineering College (AEC). Following are the reasons for the same:

• TU has great faculty and infrastructure, and you will get a lot of exposure. 
• The only drawback is the lack of placements. Being a new institution very few companies visit the college.
• AEC on the other hand, is very old, and has a strong alumni network. 
• Placement is better at AEC compared to TU, but still it keeps fluctuating which makes students unsure.

If your aim is to get a job right after your graduation, then you should join AEC. But if you are interested more in research and exposure and want to opt for higher studies, TU will be a better option.