i disagree, im just not a fan of satriani.. he is not very original, im not a fan of his playing.
Grohl is the drummer of the band, which is what he does best imo. And Kurt Cobain is an amazing songwriter, but he is not that good on guitar, he can play simple riffs and solos, but nothing advanced. I love Cobain, but he is not that good on guitar. Grohl is probably equally skilled on guitar to Kurt.
And i think Grohl is cooler.. he is a Zep fan. So he is automatically awesome! lol