I've had one exotic drop from PvE. One. All others I bought from Xur. You can get to 30 with Iron Banner gear. Raid weapons I'll give you. But in regards to the ability to choose how to "become legend," PvP players have the hands-down advantage thanks to the plethora of vendors for them. You can use crucible marks to very specifically CHOOSE your gear ... What stats/weapons you want to boost. Can't do that with RNG and two choices to make purchases. So when I say "heavily favors," it's the gear to which I'm referring. With the exception of raid stuff, PvP players can get everything PvE players can get and then some.