Soundgarden for me. They've got that extra cool factor of Kim Thayil's mysterious brooding guitar freak-outs and Chris Cornell's beautiful twisted songwriting (both lyrically and musically). Plus Matt Cameron is the best drummer of any of these bands (Peal Jam would probably agree! lol). And it's those proggy time signatures and weird tunings too that satisfy my more technical side.
After that probably Pearl Jam, mainly because Eddie Vedder really is just that great of a singer and often enough that great of a songwriter too.
Then would come Nirvana, who I used to dislike until I got over my prejudice about them "killing classic rock" or something, but still view them with a dash of "well they weren't all that." Very tight, idiosyncratic songs from Kurt, and Grohl and Novoselic were not a rhythm section to be trifled with by anyone.
...at the end of the day I vastly prefer the Foo Fighters though.
Then we have Alice In Chains, who honestly scare me a bit with they're darkness and gritty, addiction addled despair. On one hand, I think they're fantastic musicians and songwriters and have at least one masterpiece of an album in Dirt. On the other, they're not anything to be listened to lightly (which you could say about most of these bands, really, but it's especially true of AIC).
And last but not for much of a reason other than underexposure, STP. I'm not the hugest fan of their "big" album Core, though I do dig the hits. But after hearing Tiny Music From The Vatican Gift Shop, I realized these guys had a lot more versatility than they were given credit for when Plush hit it big. They almost sound brit-pop on that album, and I really enjoyed their 2018 album as well. So a really underappreciated band, but I think it's because they usually only get talked about in relation to the four giants I myself have placed above them. Oh well.