Sakuraba wrote:As such, i guess my question is not really "what class has the strongest rank 13 set" but rather "which sets are worth it and which are not?".
That depends entirely on what you intend on doing. If you want to PvP, the r12+ stuff is really good until you get to AQ40/Naxx lvl PvE gear. At that point, the glass cannon vs. tankiness of the gear sets even out. A r14 warrior doesn't hit as hard as an arms warrior with an Ashkandi and t2.5 gear, but he's got more HP and set bonuses that are more beneficial to PvP.
If you intend on PvEing however, you'll replace most, if not all of it by the time you finish BWL, so the time investment you'd make in grinding out r14 isn't even close to worth it.