I personally can't stand VH any more than Poison, but this does speak to RockinRight's point: Eddie Van Halen sees himself as a creator of high art, whereas his vocalists are just party guys Cabo Waboing and Just A Gigoloing their way through life.
Eddie Van Halen is a curmudgeonly perfectionist. And, let us not forget, a drunken mistreater of Valerie Bertinelli - who is now reduced to doing Weight Watchers commercials.
Aye and one of the most blinding talents of the rock era. I know there's plenty of debate about the originality of some of EVH's technique but he brought it to the masses and made it instantly recognizable even to non-guitar-heads.
CC DeVille is a root-fifth hack with a ridiculous stage name - but a decent bloke in interviews and riding the gravy train until the wheels fall off.