Originally Posted by
Impatiens
The main reason people choose halfling over dwarf is enhancements. Halfling Guile has great synergy with a monk and they get racial enhancements for Dex, dwarves don't really have any racial enhancements that are super beneficial to monks. I tend to put level ups in Wisdom, this benefits both DCs and AC. With the builds you have you will need to either get a +2 tome or put two levels up in Dex to get to 18 for GM Wind stance and 17 for GTWF, but I assume that's what you'd be planning for anyway since you mention getting the last tier of earth for the dwarf which would also require a tome.
Honestly what you have so far for both builds looks fine and if you like dwarves better than halflings or just want to be different, go for it. A dwarf monk isn't bad, but I would say that a halfling pulls a little ahead just because of the enhancements.