sorry for the disagreement.... BUT I think orcs make far better warriors and tanks. the tauren raical is bonus base health, this doesn't include gear and therefore won't benefit from high stamina tank gear. the orc stun reduction can be just as important, if not moreso than the couple hundred extra tauren health. at level 85 stats may scale so you receive a couple thousand extra health, but really this is more of a fixed number, and this amount of health would be a consideration if it was given to a level 80, however 2000-4000 extra health at level 85 (not yet sure what the actual base health of a level 85 will be on live on live) however this is nothing on a level 85 taking 50,000-100,000 dmg hits from a boss. its just as insignificant as a level 80 receiving a couple hundred bonus health from being tauren.
I don't think the 2 second stun is a big deal considering cooldowns and the time it takes to cast it... its extremely negligible, and not a consideration for choosing that race as a tank in my opinion.
the orc receives some of the best dps racials available. blood fury will be equivalent to 30% of an epic level 85 activation trinket when it scales to level 85 (similar to how level 85 blood fury was 30% attack power of the level 80 epic attack power trinkets)
blood fury:
level 80 = +340 AP
level 85 = +1170 AP
not to mention orcs get free expertise for using axes, which tanks need very much.
TL;DR the tauren racials are more of a flat bonus while the orc racials are more of a percentage, which scales much better and doesn't become useless right away
edit: and for someone saying "tanks don't need dps racials" don't bother... dps will always be good for holding aggro or gaining it quicker, whether its in the form of AP, expertise or 15% less stun time = 15% more dps + threat + survivability while stunned