Does it matter what online site you play at?

[Rubber Soul]

Having played for two years online in low stakes games I am beginning to think that it doesn't matter what site you play. I have won at almost every site I have played (UB, Bodog, Tiger, Party, Pacific, Stars, etc.) and I just make slight adjustments to my standard tight/aggressive play based on how loose or tight the table I'm at is... Does anybody else think it matters where you play online in small stakes games as long as you are a "solid" player?