Well I know it's not the real reward but it feels just silly. Tullius's armor is probably the best looking Imperial armor ingame, and it's Heavy!
Yeah, it looks great hanging on a mannequin in my trophy room.

But if you think about it, it wouldn't be realistic for your commander in either case to give you a set of armor identical to his just because you helped him win the war. "I really valued your assistance, oooooh I know, let's dress alike and then people will know we're totally BFFs cuz nobody else wears this but us!"

And let's not forget, that you also get to claim Hjerim as a residence and can become Thane of Windhelm. So, you're given a weapon of honor, and the right to purchase a property and obtain a noble title that would otherwise be unavailable to you in the game. IMO, Hjerim is right up there with Proudspire Manor in Solitude, and while you can purchase it a little in advance of the questline's completion on the Stormcloak side, the thane title is only offered once you've completely finished the questline no matter whose side you chose.
Not quite correct, if you take the Stormcloak side you can become Thane before the war is finished; it's either at the same point where you get permission to buy the house, or the next time you report to Ulfric. You may have to re-engage him in conversation after all the stuff about your current/next assignment is out of the way, but if the title is available you'll have the option to ask if there's anything else he needs and he'll go through the usual Jarl spiel about what's required in order for him to give you the title. If you've already met all the specs, just disengage and re-engage and tell him so and you're in like Flynn.
