Im sure youll never get a full answer to this just alota opinions because both systems are well proven to do what they do and that's shoot things. Pistons do not get as dirty as DI and the heat is more towards the front. Your best bet is to find what guns are what and read reviews and so forth about them. Often or not Piston vs DI turns into AK vs Ar15 And then AR15 DI vs the newer AR15 Pistons.

For your first AR personally Id go with a DI Ar15 and learn how that works and how to maintain it first since its still a more widely popular (as in the amount out there)System.


As For brand i hear bushmaster alot as a cheap good AR15 brand. (someone correct me if im wrong)