I voted STP. Lots of people that still accuse STP of sounding like Pearl Jam only heard a couple of songs from their first album and then wrote them off. They developed a pretty original, diverse sound later on and have a couple of really great songs. They have some HORRIBLE songs, don't get me wrong, but I think a lot of people didn't give them a chance.
Then again, I never got into Pearl Jam at all besides they're early stuff, so if Pearl Jam's later albums sound like STP's last three, then please inform me so i don't sound like a fool
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Also keep in mind i used to be a huge fan and i have a certain nostalglia for them, that somewhat overshadows any bad songs that they've put out, as well as Weiland's horrible personality.