Hello.

MSc-PhD would help you develop your core in the subject while MTech-PhD would give you a great exposure to practical knowledge. Both of them are usually pretty much similar but it's just the degree that varies. You'd still have a little theoretical grip in MSc while MTech would completely be research based. The PhDs in both cases would still have the same value.

I hope I've cleared your doubts, if you still have any other doubts, feel free to ask.

Thank you.