Well, i know there have been a lot of posts like this...by i really wanted to start a new one since i really love to talk about HOMM ...
Ok, for me...is not that easy, so i will make a quicky review of each town(HOMM III, since in my oppinion is the BEST ONE OUT THERE), and tell u what i think about it's units...mainly naming the best ones and something i would like so see differently...
Castle-This town in a must have, since here are the good guys, and is one of my personal favorites. The CRUSADER isn't only a MUST have but is definitely my favorite unit in these town, Archangels are the trade mark of course, and maybe monks could get some kinda first aid spell or even resurrectin or something like that, maybe even prayer so they look more like a cleric instead of a "mage".
Necropolis-Must have too, i mean here are the undead, u can't hate this guys. Vampire Lords are AWESOME (even though i HATE the look of HOMM IV, they should stick with the nosferatu look of HOMM III), and Death Knight are really cool too...even though i would like them to look more like a Ring Wraith (NAZGUL in the LOTR) but o well...over all an awesome town!
Tower-Well, it wouldn't be a Might and Magic game without the magic, right? This town rocks, even though i would suggest some changes: goblins must get a new look (that clown outfit is not good at all!), gargoyles should get new look too (bigger and more menacing), Golems are a must have, so do magi :P, and Genies(never really like them)could be changed for something else, different look, same "abilities" maybe an enchanter of some kind, magi, look cool so they should stay, and nagas and titans are a must have, even though i would suggest a new look on the titan.
Dungeon-One thing that Trully bugs me is the fact that here lies a town mostly based on greek units and then there lies the DRAGON, i think this town should be rearanged, only greek units...maybe even moving the titan here and leave the dragon to the tower, for image purposes. About the units, the DRAGON is the only one i trully like :P!
Rampart-Another town that trully bugs me! U see i am a BIG Tolkien, D&D fan, meaning i can't see elf and dwarves fighting along side each other unless it's an impossible quest to save the world :S...this town has a lot of potencial if it would spread in two...having the elfs, dendroids, and unicorns in one side, and dwarves, rune lord (my idea of a new unit), berserker (another new one) in the other side.
Stronghold-Well, i like this town, even though i don't like playing it, i like playing against it...since this are mainly the orcs. I suggest a hole new look on the orcs, make them more like BIG ORCS and add wrog riders instead of wolf, and maybe some true mighty TROLL insead of the Cyclops (another greek units missplaced :S)
Inferno-Well, well, even though i think it's units should get a total make over, this is a good town! And a must have since u got tha Angels, so u need the Devils (i love the look in the preview screenshots by the way)
Fortress-I hate this town, i don't like them at all...their units are totally mixed up...Hidra (another greek missplaced unit :S) and dragon fly (come on!) the only thing i like about this town is the basilisk and the gnolls the rest i don't care at all!
So, that is it...if i had to choose a town to leave it would be the Fortress, i won't give my ideas on the conflux since i think it should not be a town at all...elementals should stay as neutral or summon units not as a town (at least that is my idea)