B.Tech Computer Science and Engineering

CSE is better than it.

You can check the below mentioned link:
https://www.shiksha.com/b-tech/course/b-tech-in-computer-science-and-engineering-school-of-engineering-and-technology-ansal-university-gurgaon-751

Both are good, you should follow your intentions. If you are good at computer programming, it is better to take CSE. Otherwise, mechanical is much better.

No, it is not hard. All the languages have almost same logic. If you can clear the notes, then programming is not a big deal.

You will come across, C, C+, Java, Python, SQL, PHP, JSP, ASP and many more.

It is a good college for CSE and rest depends on your effort.

B.Tech in CSE is engineering degree and better in comparison to BCA. MCA graduates are treated by IT industry equivalent to B.Tech CSE. BCA graduates get lower end apps development jobs, whereas CSE graduates are employed in both systems and apps development. CSE graduates get better salaries in comprising to BCA graduates.

NIIT is a good option.

Ansal is a good option.