Looks like Rock n Roll Over gets the most votes overall.
If you have Alive then Creatures is the one for me. Hotter than Hell has some genuine highlights but it is not my favourite Kiss record production wise (muddy bottom. no oomph) and you've got the best songs already. Creatures acknowledges a new decade without being slavishly 80s. If you like a bit of Iron Maiden and pre Sammy H Van Halen then you should be up for this one. Hotter Than Hell has more of an Ezrin/Alice sound to it.
Hmm. I like Ezrin/Alice more than Maiden/Van Halen...
Play the samples in iTunes and see what you think. Give or take some chugging guitars the difference is all in the production.