Diablo III: Reaper of Souls

Never realized how efficient bounty runs were for Sub-70 characters. I always did T1 Rifts on my Crusader since the 30s and I figured they were the best source of EXP. Didn't realize bounties were better until I did a couple just to get from my upper 50s to level 60.

The "Clear this dungeon's 2nd floor" Bounties give a ridiculous amount of EXP. I think sometimes they'd give my DH a level and a half when I was leveling her.

In contrast, the "Defeat this boss" give the worst, and shouldn't really be bothered with unless there's a specific reason you want to do that boss outside of EXP.

In my experience the best way to level a character is to do the dungeon bounties for each act and then reset.