http://www.tifaq.org/keyboards.html has done this for alternative keyboards (see the Contents sections on the left) for contoured, split, ergonomic, chording, and so on. Bit dated now, but still interesting.
I help maintain on occasion the /r/mechanicalkeyboard wiki entry for Ergonomic keyboard buying suggestions. After using an Ergodox for five years now, I can hands down say that this is one of the best choices I made for myself, but not that anyone should make based only on my recommendations.
