dunno if I'm just looking back on it with rose-colored glasses because it was the first one I played, but I really enjoyed (and still enjoy) Awakening. Sure, the story and overall gameplay may be nothing to write home about in comparison to other games, but I still get a kick out of playing Chrom and Robin's adventures in Ylisse.
Fates: Conquest is my favorite FE game, even though the story is not great. The gameplay and characters really did wonders for me. Behind SoV, I think Conquest might have one of my favorite character casts. The other two games I've only played through once, but I did enjoy them a lot when I played them.
If Nintendo and IS ever decide to do a remaster of Fates on Switch (to fix the story), I would be right there in line to buy it.