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Here's my take
XY's main game was pretty lackluster and short but otherwise inoffensive, but it really shines postgame with breeding and competitive.Shit like the PSS, GTS, Horde Battles, Friend Safari and Super Training (and DexNav in ORAS) made breeding Pokemon actually kind of fun and not as tedious.Plus fairy types were neat additions, although some choices for megas wee questionable
SM has a better main game on its first run, with better characters and a better evil team, but replaying is a slog. Totems were a fresh change of pace but Z moves were pretty pointless, and having Pokemon call for help was pretty frustrating. They omitted pretty much everything from XY so online was kinda bad.
Both had a good selection of mons but they're pretty on par. I'd say I had more fun fucking around with XY's various features than going through SM's story, but SM's still is pretty good
Dunno why there is so much XY hate though. At most it really suffered from not having a third version