Also, got to admit, 2x shrunk ogres are pretty badass.

Ogre shamans can solo a lot of higher end mobs that other shamans simply cannot.

You can step back forward to regain concentration.

Trolls can get the Dark Elf clinging darkness necklace tho if they worship inny~

Noleaf: I only made the shaman relatively soon before the double exp weekend, so I couldn't tell you; it's totally possible that it was just a temporary bug and not something that had been in there for a long time.

Alawen: What is it about ogre shamen that lets them solo higher end stuff better? I'm assuming it's some kind of ogre-specific gear?

So doesn't sound like barbarian shamans are in demand unless you really want to be good or really don't want an exp penalty.

I am curious if that snare necklace for troll is a game changer or not.

Barbarians have an EXP penalty, but a smaller one than ogres:

From the FAQ:
What are the experience penalties/bonuses?
By Race:
Troll -20%
Iksar -20%
Ogre -15%
Barbarian -5%
Halfling +5%

I played my Troll Shaman to mid-20s before I re-rolled as Ogre and I can say that unlike on my Troll, my Ogre always got Root when tanking a mob. I never failed once and that saved my ass countless times. My Troll on the other hand would constant interrupts. I can't explain exactly how the no stun mechanic works on this server, that's just my personal anecdote if it helps you any.

And the snare necklace is wayyyyy overrated and definitely shouldn't be the basis for your Shaman's race choice. The snare % on it isn't even that good.

Go Ogre or go home.

Barb Shaman are fine. play what you like. I rolled troll because well, my last shaman was barb and I wanted something different. True, troll regen is legendary up to about lvl 9-10 beyond that its less important as youre hp pool gets bigger. at 50 its a drop in the bucket. I'd have gone Ogre but plain and simple, I dislike the way an ogre looks in chain, and I hate Oggok.
Just for my own satisfaction, I PLed a troll shaman and a barb shaman to 35 on PEQ, measured how long it took to regen from under 10hp to full each wearing +5 regen gear (more than is possible on P99) in bearform, with regrowth on. the difference was, IMO, not that big. Certainly not game-breaking. Maybe not even enough to counterbalance the hassle of banking in Neriak, and the exp penalty. Stun immune is quite a benefit though. I wont lie. Pretty often I wish I was stun immune. I wonder if at 50+ as an ogre I'd ever wish for better regen?

As for more concrete differences: Barbs have more starting mana from a higher base wis. Canni makes maxing wisdom less important than other priest classes, so once you get a solid number (I'm gonna stop stacking at 190-200ish -maybe less as I get a better feel for it) then you can make your HP pool into a defacto mana pool. so we stack stam. Ogre is clearly gonna win this contest, but the troll has a large hp pool, and the regen+regrowth+bearform regen will go a long way to negating Canni especially until Canni IV, which takes some huge chunks of life. Barb will just have to cannibalize less, via bigger mana, or gear differently to stack stam.
In the end, playing the min/max game is much much less important than comparing say, warrior races.
Thats my 2 cents.

TBH, the fact that you're asking this question makes me think you want to min-max race, so disregard anyone telling you to play barbarian. The wisdom the race has is a non-factor, considering how many wis items are prevalent, and how much that statement is going to hit home in kunark and velious even harder. You'll be soft-capped there, even focusing more on hp/mana, etc.

Ogre to do harder things (stun immunity for particular encounters) and be more survivable when beat on

Troll to kill faster, stay afloat on mana more.

All the races can do the same things. There's no "only ogres can do this". Frontal stun immunity is very strong, but don't go telling people it's a requirment for anything. It's as stupid as that other thread where people claimed only ogres could be raid tanks.

The place where it matters the most is when soloing really tough mobs, something that doesn't become much of a factor until Kunark and especially Velious. Shamans were legendary for soloing guardian wurms, and once you get your rare high-end spells and good equipment, anything that doesn't out-damage your healing while slowed is soloable. Being an ogre made this a fair bit safer since you might occasionally end up in a situation where getting interrupted meant dying, but it wasn't what determined whether or not you could. Race alone will never determine whether you can or cannot do something in this game (other than do certain quests and use certain items, of course).

The thing about stun immunity is that it doesn't always help. It's a great ability when it lets you get off a spell that makes the difference between failure and success, but it's not as if that happens all the time. Unless for some reason you made your shaman to solo exclusively, the vast majority of your time will be spent in scenarios where the stun immunity doesn't matter at all: when you're not being attacked. Bonus regeneration generally has a more constant value in that shamans should almost never stay at full health unless they're also at full mana. This means that the troll/iksar racial helps even when you're sitting on your ass healing a tank where ogres and barbarians otherwise have nothing. Well, barbarians always have nothing.

Troll regen essentially translates into a bit of flowing thought, not a whole lot but certainly a noticeable amount. It's very valuable until you get torpor and the big canni, at which point it sort of stops mattering since you won't be relying on actual regen anymore. Then ogre becomes the only race choice that makes a difference. Up until then, it's just a matter of preference: trolls have more staying power and ogres have more reliable spellcasts. All things considered, across all three eras, ogre has an advantage because their racial ability never becomes obsolete. It's nowhere near game-changing, though. People seem to think you spend half the time stunned when tanking.