I'm a bit blank at the moment for an opening post, but you get the point.
I personally prefer the Serie A and Bundesliga to all leagues, while I find the La Liga the best in overall quality. I find the Premier League ridiculous and feel it has the lowest quality of football outside the top 6 leagues (Spanish, Italian, German, English, French, Portuguese)
Also Greek league is unwatchable as it's the most corrupted league in the world by far where 14 out of 16 teams are there just to benefit one team (Olympiakos). So we have the future champion, who is known 3 years before the league begins, playing 28 friendlies out of 30 fixtures and in case they suck too much the refs make sure they win Undefeated championship for 2012-13 season and I've known it since October 2011 ffs
I watch Panathinaikos in Greece, random Bundesliga games, random La Liga games, lots of Serie A (and all highlights) and an occassional Premier League game if I'm at a pub on a Saturday or actually attend a game*.
* I'm on a mission to visit all London grounds on a matchday, halfway there Including lower leagues.
Be sure to state with honesty which leagues you watch in your argument. AND BE SURE TO HAVE AN ARGUMENT AND NOT JUST A STATEMENT!