Umbreon is my favorite, but Sylveon is the superior combatant.
It really is a badass though. lol
The Eeveelutions are pretty fragile but iirc, Sylveon can be built up pretty well.
Umbreon and Vaporean are pretty tanky. Especially Vaporeon. Umbreon has an unfortunate Fighting weakness, which is super prevalent in competitive play.
Leafeon and Flareon have terribad movesets.
Glaceon is fairly slow and fragile, with a stealth rock weakness.
Jolteon is fast but suuuuper fragile. Espeon isn't as fast, but can take a hit or two.
Sylveon is really well rounded with Dragon Immunity and Pixelate. GG.
Sylveon is slow and can't take physical hits.
Competetively, it resists quite a few common attacks and outright ignores one of the the deadliest. And then proceeds to OHKO the opponent if they don't swap out.
Admittedly, the meta when I last played was heavily stall/bulky attacker focused, so Sylveon out sped most enemies and laughed in the face of the prevalent Dragon types. And Pixelated Echoed Voice *** stall teams hard. 390 Power off of a 110 SpA huuuuuurt.
Idk what the meta is these days, but ever since Fairy type came out, might as well not use dragons or make them a mainstay. Got dicked down pretty hard by the introduction of Fairy.
I always liked to make my teams mostly "sweepers" I guess, but I wasn't ever really into spending time on EVing or online. Just beat up my roommates and friends who didn't EV at all like a ***! xD
My favorite types are fighting, flying, fire, dark, steel, and poison. I kinda flirt with bug sometimes, things like Yanmega oh baby~