Preferred Ancient Wars?

[Bandito]

I was definitely going to get one of these games at some point, but I don't know which one! Is it all a matter of taste and what era one would prefer to play in? Which is the newest?

Punic Wars
Gallic Wars
Alexandrian Wars

Perhaps it might also help me if I had an idea of the kind of terrain I should be expecting in any of these games, and maybe even the types of units available. Gameplay videos would be nice also, if they're out there.

Are they based on Decision Games's "Battles of the Ancient World" set?