Left Coast DJ
Android Enthusiast
I don't think you should let the difference between 8 and 5 megapixel cameras sway your decision. All it means is the Thunderbolt can take larger pictures. The quality of the pictures is more a matter of the lens and camera software. For example, the iPhone 4 with its 5 megapixel camera shoots better photos than almost all higher megapixel phone cameras. I do not have any experience with HTC or LG cameras though.
However, if both the LG Revolution and HTC Thunderbolt are released around the same time, without taking each of them for a spin, I'd lean towards the Revolution just based on that I read its interface is pretty close to being stock Android. That would be a major bonus so I can customize it to my liking rather than being locked into HTC Sense (though I've heard Sense is pretty good).
However, if both the LG Revolution and HTC Thunderbolt are released around the same time, without taking each of them for a spin, I'd lean towards the Revolution just based on that I read its interface is pretty close to being stock Android. That would be a major bonus so I can customize it to my liking rather than being locked into HTC Sense (though I've heard Sense is pretty good).