Chem is best option
Bio tech is developing so if you masters that it may end with great scope . As its growing branch .
While Chem is already flourished one .
Take botany if you love plants .
After all choice depends on how you want to spend your rest of life I mean what you will do with great happiness without being bored .
Do any stream but reach the highest achievable level for that..
I hope this will gonna a help you in deciding .