You're missing the point bro.
We're talking about staying power. ie. Longevity in terms of playing the global live circuit. Number of studio albums recorded and sold.
Pearl Jam have been touring non-stop for TWENTY FUCKING YEARS. Soundgarden & A.I.C spent most of that time dead or broken up.
Pearl Jam have released NINE studio albums. Soundgarden 5. AIC did 4.
Smashing Pumpkins aren't even worth considering... After Mellon Collie they lost their musical direction, lost their identity and lost their line-up.
Don't get me wrong bro, I would take Alice In Chains (my fave) or Soundgarden ANY DAY OF THE WEEK over Pearl Jam. But when we're talking about the facts, and looking at it objectively, you can't deny Pearl Jam's staying power.