Supernatural for me. That record was a revelation. Not only one of the biggest comebacks in music history, but it showed Santana really branching out to modern audiences.
A lot of Classic Rock artists were happy to try and chase the charts in the 70s with disco, in the 80s with funk, and in the early 90s with alternative. But Santana's really the only one to stand up and remain relevant to modern music at the turn of the century and I deeply respect that. Artists like Neil Young and Tom Petty could easily be back on top with indie rock records today but they've kind of given up and followed pet projects instead, which is perfectly fine (some of Petty's latest albums are his best), but it would also be cool to see them dominating stadiums again and going out in style like Roy Orbison was able to.