Mechatronics Engineering

Modern production equipment consists of mechatronic modules that are integrated according to a control architecture. The most known architectures involve hierarchy, polyarchy, heterarchy, and hybrid. The scope is limited as of now but its growth would be tremendous. An industrial robot is a prime example of a mechatronics system; it includes aspects of electronics, mechanics, and computing to do its day-to-day jobs. With this specialization you can have good scope outside India, specially in a country like Japan.

mechanical is better

Amar go for your degree. After diploma you will get admission in 2nd year.of B.Tech also called lateral entry.
For lateral entry, you have to appear for Lateral Entry Engineering Test (LEET). You must have min.of 60% marks in diploma to appear for LEET.
If you have not given LEET, then opt for good private universities. They offer world class environment to students along with good placements. Some even offer good scholarships to students. Check their websites.
Good luck.