Staying within the original bounds of discussion, I'd say Neil Schon.
Depending on your definitions of "AOR" or "best", I'd introduce two hitherto unmentioned options:
Chris Hayes with Huey Lewis and the News was one of the best role-playing guitarists I can think of. When he soloed, it was always what was called for in the context of the tune, his tone was always 100% right-on, and he was never distracting in a way that implied he was better guitar player than the gig called for. Check the solo on "Sooner or Later". Again, in the context of the tune, a great solo that sits where it should. Same with "Heart and Soul" or "New Drug". You're not going to think, "Man! That guy has chops to burn", like Lukather or those guys, but what he played always fit the tune and his tone was great.
Mike Slamer with City Boy was kind of the same way, except he wasn't fitting the role of an AOR or singles-oriented band like Huey Lewis. I don't even know how you'd classify City Boy, but Slamer was a cool and tasty player. Check out the solos on "Dear Jean" - they're a lexicon of '70s guitar licks, but his sense of phrase and line are awesome. Plus, again, if you want to talk about tone, he had the sound in spades.
Again, neither of these guys are going to compete with Lukather or Schon in the shred category. but as far as guitarists in AOR bands that did the perfect job, they're my favorites.
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