PerfectMongoose3 is an improved PW2 (a Civ4 "downgrade" from Ceph's Civ5 PW3 script...) but 1) no marsh, 2) from what I saw, deserts were VERY rare. So if you don't want deserts, marshes, peat bogs, or storms this one is nice. PlanetGenerator 0.68 can probably make better maps (with marshes...