Out of all of those? Half-orcs.
Why? Two reasons.
1) The big one is that the majority of half-orc backgrounds seem to involve rape. Not unlike Drizzt, this might be an acceptable background in moderation, but when it's the standard, it becomes very, very uninteresting as a background. Compounding this is that, if a half-orc is not the product of rape, the background seems to end up being something bizarre - there are relatively few instances of a human and an orc having a family together.
2) Mechanically, the 3.5E half-orc was underpowered and uninteresting. I never bought the idea that Strength was the most important and valuable ability score. And the only thing half-orcs got in 3.5 was Strength and Darkvision.
Why? Two reasons.
1) The big one is that the majority of half-orc backgrounds seem to involve rape. Not unlike Drizzt, this might be an acceptable background in moderation, but when it's the standard, it becomes very, very uninteresting as a background. Compounding this is that, if a half-orc is not the product of rape, the background seems to end up being something bizarre - there are relatively few instances of a human and an orc having a family together.
2) Mechanically, the 3.5E half-orc was underpowered and uninteresting. I never bought the idea that Strength was the most important and valuable ability score. And the only thing half-orcs got in 3.5 was Strength and Darkvision.