Two weapon wielding is a sub-optimal choice for a straight-up fighter. Which (IMO) is as it should be. A rogue fighting with two weapons is more likely to cause greater damage than a Fighter two-weapon wielder, assuming he can get the flank in.
You can't compare a two-hander, with a two-weapon wielder as everything about those two characters will be different according to how they optimize the different styles. This is from how they chose to assign stats to their scores, to the equipment they puchase, the feats they choose, and the classes/PrC they pick up on the way. You cannot assume stats will be the same, because this imposes a limitation which a player would not have to abide to. Nor can you invalidate a whole fighting style just because it provides far more benefit to the rogue than the straight fighter.
The sword and board is already sub-optimal in the long term, due to the existance of the animated shield. If you go this route, you are sacrificing long term power for short term survival (not a bad thing, but a choice you need to aware of).