In my honest opinion, Orc all the way.

...

It doesn't really matter how dynamic fights are. In a group fight, there just is no good reason to stun a Shaman. In big world PvP fights people aren't going to walk up to you and stun you. People are going to AoE as much as possible. And being able to stun 5 people at once in a group fight is WAY more valuable than resisting one stun. And in BGs it's the same deal. People aren't going to be focusing on you, doesn't matter if you're fighting inexperienced players or not. People want to see big numbers and the classes that throw around the most stuns (Warriors, Rogues) won't get to see big numbers by trying to kill a Shaman.
1v1 stun resist is very good, and arguably better than War Stomp (though I personally prefer the combo potential). But in group fights, stun resist is not going to help you because your biggest enemy will be ranged, magical damage and that does not tend to stun you.

Oof

It doesn't really matter how dynamic fights are. In a group fight, there just is no good reason to stun a Shaman.

What? It does matter... When you have an uncoordinated group of pugs smashing into eachother repeatedly there wont be designated CC or kill targets. OP will be stunned constantly. Joining pugs means that OP will regularly be the closest thing the team has to a healer if he is playing Ele. The typical group comp OP will be in? 9 DPS and OP.