Fast > Necro can basically use pet and lifetap and self mana lich to get to 40, then it gets more complicated.
Slow but simple, Mage, but they actually have some depth. It will take forever to level a mage or wizard if you don't learn the tricks and jump through some of the quest item clicky hoops and get gud. Same with wizard, wizards are hard if you are not a very patient conservative player.
Monk? IDK
Shm, u can play them like a wizard. Druids can be played like wizards. Just root, snare, kite in open zones.
I imagine your question should be were can you level that allows for a simple playsstyle, mostly outdoor zones, and druids and shamans excell at that. Pet management can be annoying.
As a druid you have the option of charming outdoor mobs which adds a little complexity but isn't neccissary and sometimes hinders if the mobs are dying relatively quickly.
Druids can hunt pretty safely in SK, Everfrost for a big chunk of the game getting 20-40 fairly easy without a ton of effort, track makes finding mobs easy and less of a hassle.
On a wiz or druid, you don't have to quad, quadding is complex, it just cuts leveling time by a factor of 4 which is a big deal to some people.
The big benifit of mage is you will be able to solo farm mobs under lvl 40 with easy and not much effort once you get there, you can easily use that mage to do quests or get gear, most people do this for other characters.
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