I avoid them altogether. Unfortunately, "free-to-play" games have become the mainstream on Android, which is the reason why iPhone and iPad have superior gaming ecosystem.
Living in both "ecosystems", as you call them, I can nary tell a difference between the two in terms of pricing model preference. Right now developers are releasing on iOS first, certainly, and that would be an advantage, but that's about all I could point to.
Most freemium games are of little interest to me, but there are a few that I do enjoy. For some reason, I love Stardom, which is kind of embarassing. I've thrown them $10 in purchases not because I needed to (I already had done all there was to do in the game), but because I had enjoyed it so much that I felt good giving them some cash.
I also like Coin Dozer quite a bit. I know a lot of people get frustrated by the "energy refresh" model, but if a game is good it's probably the freemium model I have the most tolerance for.