An easy way to test the balance is to just have a min/maxed oghmir and thursar in the "best" gear take turns hitting eachother, and see who dies first. Have them use heals and all their skills if you want. Try different variations and scenarios, note the outcomes.
Do it multiple times and get an average to level out the RNG. Factor in hitbox difference also.
Movement speed only really matters when running away or chasing someone down, as moving faster in range of an attack doesn't necessarily mean more of an advantage. Some people are better at hitting fast things, and worse at hitting slow moving things. Also, you can turn at any speed you set your sensitivity to. Not that speed really matters much in this test because the speed difference is so minor.
In the instance that either party tries to run after entering melee range, it'd be unlikely either could get enough distance to escape using their run speed, so i just don't see why it is that important in this test.
If we're arguing utility outside of 1v1, well, that is trickier because it really depends on the factors of the scenario. Example, you could say having a big hitbox is a disadvantage, however, it is also an advantage in other scenarios.
You have a higher viewing position, you can block attacks aimed at teammates better, you can draw attention better. On the flip side, you are easier to hit and easier to see.
All this being said, is it really necessary? Oghmirs are clearly overtuned, it is very obvious.
Someone on the development team seems to think speed is worth more than what it really amounts to in game; that is the only reason i could think Oghmirs are so statistically imbalanced. Like, i play a lean veela, and i can run away from most situations. But if they have a horse? My stamina runs out. If i'm on a horse? They're better at killing horses with a bow than i am.
All speed is good for is running away when you're already at a safe distance, and closing the gap on someone when you already have an advantage. That is it. Other than that, it amounts to time saved when travelling without a horse. It is not at all "king" as i believe it was described by Henrik.
With horses in the game, speed just isn't as strong as they seem to think it is. Also, in a dungeon, your speed is hamstrung by having less space to move in.
Oghmirs have intelligence, strength and are tanks.. Like, that is everything. They can also just use a horse to minimize the burden of slow movement when outside of a dungeon, and in dungeon, as i already explained, speed is less useful. Oghmirs are the everything race.