I just finished Path of Radiance and kind of wanted to talk about the series.
Mine would probably be Blazing Blade or Mystery of the Emblem, BB because having some weird cult terrorist group as the villains was more fun than Evil Nation nº12837, MotE because i think it has some of the best gameplay and maps of the franchise while having a way better story than the other newer FE games (that i have played, Awakening and Fates).
i have a soft spot for awakening, since it was my first and it has a lot of replay value, but i don't think the writing is all that good. it also doesn't have anywhere between 'incredibly easy to snap this game over your knee like bane' and 'game wasn't lying that difficulty was lunatic
genealogy of the holy war has a lot going for it, but i don't actually like it all that much. it's got a lot of cool (and really impressive for the snes) stuff going on, but i just think the maps are too big for any real unit diversity to be worth it.
three houses has a lot of problems, but also edelgard is great and you get to tear down the catholic church and the landed nobility, so i think it all evens out as the best game in the series. plus i really like the teaching mechanics, even if the teacher thing makes the supports kind of skeevy
Awakening has a weird charm to it that actually make its silly jokes work, and I don't know why.
the nowi and nah stuff all sucks, but otherwise it's just a fun time imo