T10, because that was the first tier of raid gear i actually got.
Amongst all of the tier sets, I have several favorites. But, if I had to choose only one, I'd likely pick Scorgelord 264. It had a simply elegenace to it, that fit the Detahknight motif. The colors echoed Icecrown's scheme very well, and it basically encapsulated the feel of the Frost Deathknight (My spec at the time) very solidly.
I really like tthe T11 for mages . It gives them an evil fiery demon look. So mages can laugh at others like druids with wings XD. The rest of the T11 sets dont aapease me as much. T10 for palys look cool too love the helmet mostly
Mage Tier 6 was best IMO the set bonuses were great such as adding time to evocation therefore allowing bigger Mana gain and the extra damage given to the primary skills each spec used was great. The look of it made you look like an Archmage of high rank and even the fact it was 8 piece is epic meant there was actually something to do for it, also it was there before Wrath and that meant that it was also the last set any real work went toward as wrath was a bomb in terms of quality of encounters. WoW easymode.Tempest Regalia
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My favourite one is the Mage's T11 set. I like it because of it's skin and the stats it gives. it also gives you some feeling like "hmm my set if making fire - hey I might stay in fire while raiding" :) :) :)
Tough choice, but I'd say it's a toss-up between the Rogue Tier 2 and Rogue Tier 5 sets (based on appearance). Always loved how sinister each set looked.
All the sets of gear are nice. I would like the gear sets more and pay more attention if I had the ability to keep more than one or two sets of gear without overloading my backpacks or bank.So, any set is nice, so long as the stats are acceptable.
i will go for malefic raiment warlock set the fact that having this whole gear was a pain to get in the time for is coolness was something that a lot of warlock were going trought just for that not even for the stat just because it was cool and a lot just wear it still or have it in there bag because it just too awesome to be thrown out. I mean best looking set EVAR!
My favourite set would have to be the warrior T10 set (Heroic Sanctified Ymirjar Lord's Battlegear) or the T6 set Onslaught Battlegear (Onslaught Battlegear). I didn't quite manage to complete the T10 set before Cata came out but this was what I spent so many nights raiding for, for so long. It was a real shame to replace these pieces with Cata greens. The T6 set is the best looking warrior set IMO.
I, personally, love the Warrior's T4 Warbringer set. The helmet reminds me of something robotic, like a certain head part in the Armored Core game series. I know I'd use the set if Blizzard ever created that 'cosmetic equipment' feature.
The Judgement Armor set (Paladin Tier 2) is probably my favorite. Love the shoulders and helm :D Makes me want to actually do something with my paladin. Haha.
The shaman T5 Cataclysm Harness (Cataclysm Harness) Plus the weapon set "Fist of fury" (Claw of Molten Fury and Fist of Molten Fury) make for the best looking tier set in the game by far.
Lightbringer Armor http://www.wowhead.com/itemset=679#.It just screams paladin at the top of its lungs.
My favourite tier set was 7 and 7.5 because I had just gotten the entire set just around before Duel-specing was introduced on my Restoration druid. I was restoration (I level 1-80 Restoration). All my friends were healers and after getting the full tier my friends all bugged me to reroll feral, for tanking. I did. I even got lucky and found a Je'tze bell or something at the time, which was worth 10k on my server.... ....I still play Feral/Feral to this day now.