Two Things (assume pure level 20 Monk fairly balanced STR/DEX/Con/WIS):
1. Human Monk or Halfling:
a. Human - Is the extensive healing amp worth it or even remotely necessary?
b. Human - The extra feat is useful but how well does this compare to halfling bonuses?
c. Halfling - Sneak attack, how useful is this for adding to monk damage how does it compare to human monk damage output? (is the sneak attack damage a small bonus comparably or a large bonus?)
d. Halfling - Does their size reduce the chance of landing abilities with DC vs. larger foes? (Stunning Fist, Quivering Palm, Trip, etc.)
2. Light Side vs. Dark Side:
a. Light Side - There are more abilities available, but how useful are they? (a rez is nice but not necessary, and 10d4 healing AoE is okay but yet again not necessary, and +2 morale bonuses are coverable by bards)
b. Dark Side - Freezing the Life Blood looks like a useful attack and if Karmic Strike ever works it seems like it'll be very strong. How do these and their lead ups compare to the finishers and lead ups from the light path?
c. Both - The list of PREs posted by Eladrin previously, do any of these seem like they'll be path dependent?
Over my latent desire is a high HP good AC earth stance dark path human monk with healing amp but the logical side of my character building self is telling me that the halfling will be almost completely better and there has to be a good reason almost everyone follows light path. On a side note I did some numbers and made a Human monk with over 500HP and 74 buffed AC that looked pretty solid.