I never quite got used to Getty's voice, but after watching Rush some, listening more closely to their lyrics, the individual players, etc. puts them way close to the top.
ELP, CSN, super talented. I listened to a lot of ZZ at one time, but after a while most of their material sorta runs together for me. Cream was great no doubt.
SRV & Hendrix, were there other musicians on stage with those two? Sorry Double Trouble & the Experience, but the stars of he show overshadowed all you did.
Triumph, love 'em.
I can't say best, but I still like them as much or more after 50 years. Maybe rough around the edges, but hard working, get after it musicians. First 3 albums are must haves. Each member played like it was to keep them alive.