^^Nah, I see them differently enough. Lucky☆Star was more wacky than Yuru Yuri and I felt YY had more lesbian undertones (not that that's a bad thing). Then again, YY isn't one of my favourites. It's decent enough, though.
Sakurako .
Lucky☆Star is one of the very few anime that I absolutely refuse to finish. I've seen 10 episodes (and the OVA), but I personally find it boring as shit. K-On! is a yawn fest, too, but I actually enjoy the characters in that one.
Also, seconding Oneechan ga Kita. It's very cute.