If you are raiding for gear, you are doing it all wrong since gear will always melt away when next tier comes out.Originally Posted by PtrPipr
If you are raiding for ePeen, you dont have choices. Legendaries and special mounts drop only in 25-man mode.
If you are raiding as a timesink, you again have no choices. You have to do both 10 and 25 man versions.
If you are raiding to have fun with friends you do it in a 10-man guild.
If you ara raiding to have fun with large guild and/or have higher difficulty than 10-man, you raid 25.
Blizz is catering to vast amount of different players with the choices in raid sizes. Don't be limited by your own prejudices, but instead figure out what you want from the game, and it's almost certain there is a way to get exactly that.