I think Gary Moore has chopped and changed his musical styles pretty frequently - rock with Skid Row and Lizzy, wishy-washy American hard rock with G-Force, jazz-rock with Colosseum II, his (very good) rock solo albums in the '80s, then the blues period (during which he frequently slagged off his own earlier rock material), plus little side-projects like BBM, the Peter Green tribute, funky hard rock in Scars, even that Dark Days in Paradise album with dodgy dance beats.
Very few of them actually work all that well as complete albums. He's a great, great guitarist but not a great songwriter or bandleader.
Bonamassa may have a lot to prove in comparison, but he isn't afraid to acknowledge his different influences and seems to be trying to forge them into his own style. I'd rather that than a "blues album" followed by a "rock album", then constantly back and forth.
Plus Joe's 25 years younger than Gary. Let's give him a chance.