This might not be true. A 10x increase of the regen of stamina could help a lot if stamina factors into effectiveness of your actions. For example, if at half stamina you do half damage, or if at half stamina you only block half damage, or if at half stamina you get staggered twice as much, etc. then this regen could actually be very useful, especially with the perks that make stamina using power attacks more important. Stamina usually already has a faster base regen than the other 2 "attributes" so a 10x multiplier on that could be huge. And it really would make redguards more talented than orcs since the finesse aspect of combat (blocking, endurance, special attacks) are where redguards would be more powerful.
And in response to someone else's question: Yes, redguards do traditionally have a resistance to poison.
Not to mention if you pair a Redguard with Light Armor's 50% increase to stamina regen. Endless attacks I bet.
It's going to be hard for me to pick between an Orc, Redguard, and a Nord. The Nord's just have too nice of face tatoos imo. If Orcs or Redguards get anything similar, I may be happy. But being Scottish, the Nord face paint just spurs something inside of me.

It's nice to finally say all three don't look like babies anymore like they did in Oblivion. That was one of the biggest reasons I didn't pick any of them. Mainly stuck to Imperials.