I want to do a couple quick reviews of terrain generators and hexcrawl stocking methods that I've seen. Not a thorough review, but more of a quick assessment of procedures that may help or hinder generating the world during the game (as an improv hexcrawl) instead of during prep. I'll try to do a standard five-hex diameter test map for each, for comparison.
Pros: Simple and quick. Terrain is somewhat logical (no marsh next to mountains, hills and forest can intermingle.)
Cons: Some extreme elevation differences are still possible. Only handles the broadest detail. Speed will depend on the number of hexes needed.