I loved my Tier 6 shaman set, infact all shaman sets from Burning crusade were awesome looking, but as a whole, Tier 9 was awesome cause each faction had a different look!
Warlock Tier 5 was my favorite! But it's a close second with Priest Tier 2 .... beautiful armor!
My favorite tier is probably Tier 10 both because I like the way it looks, and because that was when I started raiding. I really liked the shaman set. Looked awesome.
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I rather enjoyed the Death Knight tier 10.25 blue version. I always enjoyed looking at my DK tank in that tier because it gave me an actual Death knight feel. Especially when i was raiding in Icecrown Citadal.The overall effect the blue version gave was a very cold yet intimidating look and suited most races and genders. the purple version was nice but not as good, it was more diseased look. the red felt like pure destruction. i didnt want to go to red lol.
My main is a priest, so I'd have to say Tier 5. Priest T5 is the definitive priest set for me, and Blizzard seems to agree since much of their priest artwork features it as well. Its PvP Season 2 counterpart also looks badass.
I like the original PvP sets for Warrior best, both Horde and Alliance versions, the rank 11 and higher items. Lower level stuff had the same models but ugly colors.
I have always liked the warrior tier 10 set. Looks like they got into an intense fight with lk and lk snapped the horn off one side during the fight. The way the color is and glowing style is look awsome. One of the best tier sets imo.
I've always loved the T5 rogue set. That headpiece is just fricken awesome
Rogue T5 RULES! el mejor Tier de todos
i prefer my epic wrathful. nothing like beating warriors in vicious when youre a rogue in wrathful
Mage Tier 3 (Frostfire Regalia) ought to be one of the best made sets so far, personally I really enjoyed twinking a Mage in this during TBC while old Naxx was still available. The visual effects from the shoulders and how the whole set fits together really makes it feel like a Mage's garment. Not to mention it was an 8-piece Tier set which I loved and still miss even now.
I liked the Tier one Raid set the best because it was the most memorable Battlegear of Might
One of the best sets is the Darkmantle Armor (Darkmantle Armor), it looks very slick and not too over the top, just how a stealthy rogue should be. On top of that the quest chain to obtain the complete set was very epic, I enjoyed a lot doing the whole thing and getting my reward at the end (now that is not available anymore is even more special).
My favorite is the Warlock tier 9 one. Love the entire colour scheme, and love how it looks like the evil Grand Apothecary Putress's attire.It looks evil, and purple and black is just the right colours in my head. Also, this was the first full tier set I got on my lock.
The Tier 9 Arena set Vicious Gladiator's Desecration http://www.wowhead.com/itemset=-332#. it just looks like something out of a horror movie :P