The armor rating is irrelevent since armor rating has a cap.
So it's purely down to aesthetics, I prefer Dragonplate personally, I like wearing my prey.
-Edited for readability
Oh really? What exactly is this cap and how does it affect the overall defense of the armor? Because from my understanding, better armor=better armor. If the armor is indeed capped, there is no point in ever upgrading. I might as well run around in a set of Legendary Iron armor if a set of Legendary Orcish armor is capped to the same defense.
For all of you who say, it's irrelevant, it's an rpg, it's all about immersion, or this isn't wow. To all of you, that's your own damn opinion. Personally I'm going to get and wear what has the best "stats", period. As a smith that means I'm going to wear whatever I can craft that provides me with the best defense, I personally do not give a [censored] how it looks. I don't have to look at it in game, as such one would expect the top tier crafted armor to be well... top tier. Dragonborn or not, if deadric armor provides me with the best defensive capabilities. That's what I'm wearing, there is no need for me to even look to the last perk. I understand you can get dragon scales and bones at a very early level. But you can go out and buy high level ore/ingots from smiths at the same low levels. So really when you obtain the materials is quite irrelevant.
Logically speaking, the last level of craftable goods should be the "best" per stats. It makes no sense for the teir before to be better, no matter how you want to justify it. It's re-tar-ded. Also if your other point is, you should choose based on what you like. Aesthetically. You should be able to add accents or customize armor. Maybe you want to wear a set of Iron armor that looks like deadric armor made out of Iron not Ebony, obviously you can't do this although it would be kind of neat. But seriously, level 10 armor and weapons should be stronger than level 9. That's just how it goes.