Gene's is very experimental. I don't like it, but Radioactive sounds awesome live with Kiss playing it. Peter's is the worst thing ever put out with the Kiss name on it.... it's just terrible!!!
Paul's sounds most like Kiss out of them all, and since Paul is the best singer and songwriter in the band it pretty much sounds like a Kiss album without the filler (the crappy Gene songs haha!). Overall it leans a little more towards the poppier sound Kiss adopted from 1979-1980, but ALOT better than either Dynasty or Unmasked. Still sounds like the classic Kiss, not a disco-rock Kiss, it's just more hook/melody based than riff based really.
Awesome album though, one of my favourite Kiss albums ever.