I don't watch Bundesliga, but it is the most competitive--meaning teams that have a legit shot at winning is always changing.
I love La Liga because I love Barca, but it's mostly just a Barca world with real madrid living in it with the rest of the clingers-on
I don't really like Serie A, but it is a solid league with TONS of history
I love the Premiership because I love Spurs and the level of talent that goes there constantly ensures it is the fastest league--also a VERY physical league.
MLS is my domestic league, so I will love the shit out of it, even if it isn't always the best to watch. I will support Fire till I am no longer able (i.e. death)
All other leagues are sort of superfluous--I'm glad they're there, doing their thing, but they're not for me.