- Archers for their double strike.
- Grand Elves for the same reason.
- Snipers for having no range limitations in combat.
- Eyeballs (I don't remember their exact name - the level 3 creature from Dungeon) for their piercing rays, it looks powerful.
- Mages, Archmages for the same reason.
- Monks and Liches for their strength.
- Titans - they are simply amazing.
I prefer playing with Eyeballs :)
As for the Lizardmen, I haven't checked their stats, but when I fight against them, I always have a hard time, maybe they have strong defense. - This refers to large numbers of Lizardmen.
