Troll Shamans, Orc Shamans, or, Tauren Shamans?

Which would be best for PvP?
Which would be best for PvE?
Which would be best for Raids?
Which would win in a duel? (For example, Troll Shaman VS Orc Shaman)
Which look better? But, also, WHICH ARE BETTER?!
Taurens have 5% additional health, which in my opinion they would be best as "Tank" in a raid. But fighting as a Tauren Shaman, it will attack very slowly with weapons, like swords, maces, axes...

Orcs seem to be very popular because of their Stun Resistance, +AP Buff and 1% crit chance increased. Their Axe Mastery improves their chance to hit with Axes (Or Throwing Axes :P)

Trolls have the Berserking/Enraging Spell which boosts their attacking speed. But the long 2 minute cooldown doesn't impress me. And also, Trolls seem to look cool when holding weapons and shields.

TALENTS:

Their are three choices for Talents.

Elemental - The Elemental branch of the shaman talent tree focuses on improving the effectiveness of the shaman's elemental totems. Elemental shaman DPS can easily rival that or a warlock or a mage. The reduced casting times on the shocks also mean that the shaman will be able to use the spells more often.

The Elemental branch is the damage per second option in the sham