Sunless is good to farm until 110. Get those charms then do cows to 115 then knock out some of those charms. After that I'd prolly just farm TA or K3K, depends if u need sets or SUs.
Also, can anyone confirm 115 TA gives exp? It would be stupid not to.
I can confirm that K3K and TA give exp. I grinded both from 115-120, but I found TA to be faster. Neither were fast though... I'm impressed how quickly some players leveled up. Either they're farming multiplayer or I still have a LOT to learn.