The fastest exp for a DPS comes from Bozja - it's faster than the MSQ. You can get from 71-80 in 6-10 hours depending on your use of experience buffs, and then 80-90 in likewise.

Roulettes are only faster after level 87 and only then if you can find a way to have instant queues and chain pull non-stop. In other words, with a premade group or if you're a tank or healer. Tanks and healers STILL level faster in Bozja from 71-86. The story is worth doing to enjoy it, but not for the experience bonus.