As a commander you need two things:
1) Tons of defense and survivability
2) Movement speed
For this reason, I’d go warrior. Warrior is way faster than guardian, it’s not even close in the movement speed department.
Remember, a dead commander is a useless commander. While support skills for your allies as well as CC for the enemy are both extremely important, you don’t need them as a commander because you cannot afford to take away from your own defense or your movement speed. Both professions would be very good for removing conditions, armor, and self heals (team heals are important but not for the commander). Remember, you need a selfish build! The reason why you need tons of defense for YOURSELF is because if you go down, you can’t command the train to follow you or set up siege. If you have to waypoint after a death, then much of your team will likely waypoint, even if it would have been better for them to stay. You need movement speed to go from area to area quick and be able to get the siege up in time. Also, if one of your towers/keeps is getting hit by a zerg and you need to save it, warrior has much better speed and will be able to get to the circle quicker if the lord goes down whereas guardian has poop speed. Warrior has good defense too (just like guardian) because it can have double endure pain (utility + trait) as well as the shield skill that blocks incoming attacks and a warbanner you can equip to ressurect the champion lord if you are rushing back to hold the circle.
I’m not trying to say that guardian is bad for commander, I’m just saying warrior is better. Guardian would likely be the second best commanding profession.
