The FCU w/canties is more appropriate for big tires and fenders and the geometry is more suited to it and can handle a wider variety of conditions. Due to the steeper geometry of the WT you are more than likely to have severe toe-overlap with fenders and the bike will not handle well offroad. A little bit of toe-tire overlap is not a big deal, but severe toe-fender-tire overlap can be dangerous. Your foot can jam the side of the fender into the tire and fold the fender through the fork, sending you over the bars. If you truly plan on running full fenders and want the option of going offroad the FCU is the better choice. If you just want a quick handling bike for road riding and don't really plan on riding in the rain much, then go with the Kilo TT or WT. The WT looks tempting with the steep angles and big tires, but its basically just a road frame that will take big tires and isn't going to perform well offroad and with calipers its really going to suck ass in the mud.
Good luck!
Edit: its worth noting that while the FCU seems geared a bit too low (for commuting), the WT is geared a bit too high for commuting. You are inevitably going to have to regear it no matter which one you buy. So, in that case, buy the FCU and spend the extra cash on a new ring and/or cog.
Last edited by mihlbach; 11-29-09 at 06:03 PM.