Each one has it's own uniqueness to them. Season 1 is more of just running gags that works. And 2 is personally my favorite, I think it was the funniest one. 3 is probably the most sweetest one and the least funny out of the three, which isn't a bad thing at all. Since you get a little different taste when dealing with each season individually.
Yuru Yuri is just such a joy to have. Simple, cute, fun, and sweet.
