The trouble with telling tanks W2W pulls are a mandatory norm.

[Packetdancer]

SCH has the worst kit of the 3 for leveling.

WHM > Diurnal AST > Nocturnal AST > SCH

I feel like that depends on the level range. I actually find SCH at level 50 to have a more flexible kit than WHM, at least in high-end level 50 stuff like synced Coils. But by the time you're up at 60, I think you're right that WHM's got the better leveling kit.

But yes, it's a good thing to keep in mind that different jobs have different capabilities at different level ranges; at endgame everything tends to be pretty evenly balanced, but that's not always true prior to level cap.