"All the heroes are generally good, it depends on your playing style. The best heroes in my opinion are Automators and Visionaries. The autos have incredibly low upkeep which is amazing for amassing a huge army while still making big gold. The visionary on the other hand has the best elite in terms of defensive value and can be turned into an untouchable powerhouse.

Other good heroes are Moguls (for $$$), Necromancers for their raise dead ability which allows for alot of elites to be produced cheap, and Warmongers for their offensive capabilites, but I still think Autos and Visions are slightly better,

Heros that you probably shouldnt play as are the General and Slayer. Generals are way too balanced to be an offensive or defensive powerhouse and their elites aren't great. Gens are overplayed, but that doesn't mean they are good. Slayers on the other hand are completely and utterly useless. They are a weaker and crappier ripoff of Warmonger. They can't produce units as cheap, don't get the offensive bonus that Warmongers get, and their elites aren't as strong (6 attack versus 8.) The only thing they have over Warmongers is that they dish out more enemy casualties, but that's not an important trait. If you want to be an offensive guy pick Warmonger/ SLAYERS SUCK! "