B.tech biotech is course more technical and applicable.

BSc courses are more theoretical, I believe.. though I've no clue about the practicals.

If you're still unsure, each college/ university displays the coursework online, do compare. Or talk to current students for more information.

It clearly depends on considering wat u r going to choose after ur UGs.

Taking b. Tech wud b a better option rather than bsc. More options wud b opened for u.. Preference wud also b given to a B. Tech graduate rather than Bsc.

If u want to opt for research field aur anythng else go for bsc.. Or take btech for more preferences and better tym saving.

In both the cases a PG wud b of too great help.

Good luck..!!