Don't forget the most important part!
Fashionquest wise monks look like stupid and dirty hobos holding sticks from level 1 to 60, always with the same two races. You'll be just one of the Puncherzz, Katanadragon and Lotuskick out there! /puke
Shadow Knights on the other hand is one of the most badass looking class; having access to good-ish classic choices like humans and erudites, or big bad boys ogres and trolls, and sex gods dark elves. Unfortunately no Gnomes SK yet on p99 though, or that would be the ultimate BiS choice for Fashionquest without any kind of competition.
But think carefully about the disgusting amount of precious hours you will dump on EQ and your character; that's the time you'll spend watching that tiny pixel ass, choose wisely!
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PS: untwinked melee toons can't solo past level 15. Cross this off your list. No can do. I guess Monks can at least manage to not die? at 17+ because of best FD, but that doesn't mean you'll solo XP anything hehe.