no comparison but
I do play a little VP, only 9/6 jacks or any better games or progressives. I also only play them at the place where I am staying for whatever comp and cover value there is.
Generally after hitting several casinos playing blackjack the VP also serves as a break.
Funny thing is that on my last trip I hit a $20,000 royal.
Still, when I play blackjack I expect to win and when I play VP I only hope to win.