If you're talking about stats, Florges has amazing special defense and good special attack. Overall this Pokemon is the third best fairy Pokemon. The only two better are Xerneas and Mega Gardevoir.
Obviously you can do a lot of damage with this guy, but as for movepool, it for some reason learns a ton of grass moves, even though it is not grass type at all. But comparing with others, the only ones that can compete with it is:
Gardevoir, which has better special attack than special defense. I feel like it has a better movepool for a special sweeper, and Florges has a better movepool for like special tank. (If I used the term right I don't actually do competitive) It also has a mega evolution, but I'm pretty sure there are better Pokemon to mega evolve in one battle.
Sylveon, it's basically a lesser Florges statwise, but it may have a slightly better movepool if anything at all. Perhaps it's in a lower tier, I don't really know.
Carbink, It has worse stats overall than some others but it has OP defense and special defense, and it is pretty awesome for setting up Stealth Rock and some Light Screen and Reflect.
Finally there's Togekiss, which is pretty good overall, it has slightly better specail attack than special defense, it has a pretty awesome movepool I have to say, but being good overall it may be a downside, depending on what you want to do with this fairy type.
I didn't mention Xerneas because it's a legendary and there is no comparison.
Hope I helped to some extent.