That Wizard vs Druid comparions is unfair I think .... I still stand by my first answer in this topic that Wizard is a better answer to OP's question because of
lazyness.
My wizard is 35 and druid 54, but let me give you an exemple at lvl 29 because they both get a DD upgrade at this cycle so this seems fair.
So let's say you're camping gnoll spire in SK (a very lazy camp with "fast xp" for a teleporter like Druids/Wizards because of the Scroll quest in Qeynos right? so it fits the bill)
Here is how I solo this camp with my Wizard:
3.60CT Inferno Shock = 237dmg
<get into tanking mode yay>
<throw in some Staff of Temp Flux debuff for less resists>
Global Cooldown Refresher (GCDR) + 3.60CT Inferno Shock = 237dmg
GCDR + 3.60CT Inferno Shock = 237dmg
Now the gnoll is running away and I finish him off with Solist's Icy Wand.
Total damage = 711 dmg
Total mana used = 405 mp
Total time Tanking = 7.20 seconds
Total time of the fight = about 20 seconds (Solist wand sucks
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Then sit on your ass and med and wait for next pop.
Now you try to do the same thing with the Druid
3.50CT Combust = 171 dmg
<get into tanking mode yay>
GCDR + 3.50CT Combust = 171 dmg
GCDR + 3.50CT Combust = 171 dmg
GCDR + 3.50CT Combust = 171 dmg
total damage at this point = 684 dmg
let's say your DS made some dmg and you kinda landed one or two hits between casts so that it's enough for the mob to flee... then you have to finish it off, maybe meleeing? so you snare? another smaller DD? a DoT?
Total mana used = at least 440 mp, without counting Snare and all the buffs you have on yourself and the slightly higher chance of resists and higher chance to fizzle or get interrupted cause more casts.
Total time Tanking = at least 10.50 seconds
Total time of the fight = at least 20 seconds like the wizard, most probably 30+ sec.
So this is probably a dumb way to solo on a druid, and you start using DoTs and Roots etc. fights last for more than one minute and you have to constantly refresh buffs, swap spells, switch between melee and medding, etc.
at some point you can probably sit on your ass and med and wait for next pop like a wiz.
But in the end, there is no question that the wizard is much easier and lazier than the druid (you use only
one spell! lol). and probably faster too (even though here you might wanna count the bigger picture with sow to run to the quest giver and back to camp etc.? my wizard has Jboots so not a big deal either hehe).
OP's question was "Lazyest and fastest class to level up" and for that I think Wizard is much better than a Druid. That has absolutely nothing to do with the Wizard being a better overall class than the Druid. But it's just so single-minded into having the best DDs in the game that this allows thing that "slightly worse DD" like Magicians or Druids will make suddenly impossible. You can just burn down one MOB's HP faster and better than any other class. And if that's not lazy then what is xD