hello,

yes, b.tech with work experience/research background is better for you.i think you need GATE score only to do m.tech.you'll be definitely having advantage over the fresh b.tech holders.i suggest you to go through below link:

https://www.iith.ac.in/index.php/admissions/pg/

I Hope this information will be useful to you.

if you need additional information,let us know to help you.

Thank you!!!:)