Pearl Jam had much more success than STP, though. In terms of album sales (and ticket sales). STP was MIA for over a decade before Scott Weiland finally died. They weren't exactly doing great when the 2000s came around. Weiland could barely sing in some shows. While Eddie was singing in front of packed arenas all over the world.
Here's US sales album by album.
Ten - 13x Platinum (peak at #1)
Core - 8x Platinum (peak at #3)
Vs. - 7x Platinum (peak at #1)
Purple - 6x Platinum (peak at #1)
Vitalogy - 5x Platinum (peak at #1)
Tiny Music - 2x Platinum (peak at #4)
No Code - Platinum (peak at #1)
No. 4 - Platinum (peak at #6)
Yield - Platinum (peak at #2)
Shangra-La-Di-Da - Gold (peaks at #9)
Binaural - Gold (peak at #2)
STP s/t - Nothing (peak at #2)
Riot Act - Gold (peak at #5)
STP 2 s/t - Nothing (peaks at #24)
Pearl Jam s/t - Gold (peaks at #2)