I like them both. It was the ME series that really hooked me into BW games, but these days I'm more excited about DA4 than MEA. I think that's because I have at least a vague idea about what may be going on in DA4 and that's interesting to me.
ME3 and DAI were both nice and slick looking, and they were both OK games. They're decent games. I enjoy them...overall. However, for me, they were both the weakest installments in their respective series despite being "slick".
Lessee..something more specific...okay, I like the companions better in DAO and DA2 than the ME games. The DA companions just seem more complicated. They will challenge and turn on you. They surprise you. The ME squad never did anything that surprised me, except for that one time with Wrex on Virmire. Although, I love my ME squad, I just feel like the DA companions are more....interesting.
Not so much with the DAI companions. They're alright, but I don't really care about any of them.
I love the space faring sci-fi. I think the ME combat is better than DA in that the ME series seems to have improved over the 3 games. DA combat feels a bit more confused. It doesn't feel like DA combat is improving as much as its kind of flailing about in the water.
I think DA2 physical animations of both the AI/npc and the main characters were the most fluid and responsive of any of the ME or other DA games. ME characters have a certain stiffness to them that I don't care for.
Uh, DLC, the DLC is always good. I mean, mostly, My favs were Legacy for DA2; Leviathan and Citadel for ME..oh, LotSB was good. I also liked Descent, JoH and Trespasser for DA.
Eh, they're both about equal at this point. Those are a couple things I like and dislike about each franchise.