Well, better in terms of...?? I don't necessarily think one was better than the other, but in the long run, I'd pick Stevie over Janis. I know more about Stevie. I followed Janis for awhile, but while the girl had soul and a better voice than some gave her credit for, there was no real connection for me there.
I don't have a huge personal connection to Stevie, either, but they both strike different chords in me.