Quasqueton said:Is the greatsword-wielding (GS) fighter or barbarian the best build for combat effectiveness?
If you happen to have a high strength, against a single critter that has lots of hit points, a high armor class, and that is likely to hit you no matter what you do, perhaps.
If you have a lower strength, against a mob with lesser hit points, or a critter that's got a lower AC itself, or that is only marginally abile to hit you, or that don't allow you to step up right next to them, there are perhaps better choices.