I would recommand to quest even if (whats not true) grinding is faster just because it is more safty ;-)
I use kicks uldum quest profile for 83+ Never had any problems with it apart from the occasional stuck.
i guess the fastest way is by instance buddy hunter lvl 15->52 ~ 1d 6hours / 103doungens. (no lvl gear or xp bonus) i also acceptet all quests inside the doungens...
I'd say questing, you are not relying on others, and quests give a nice experience, with Kicks questing profile I've done 1 - 58 in 1 day and 23 hours. But then again, its depends on your class and server, leveling on a pvp server wouldn't have been as smooth as it is on a normal server.
I had some problems with kicks uldum. I used gatherbuddy for the 83-85, Took a while and im sure a lot longer than a grind or quest profile but i made about 100k gold off of the ore. Why has no one suggested arch?