Get the Cross Check--more build options, better resale value if you ever get rid of it.

Just swapped a bunch of stuff over from a IRO Rob Roy (predecessor to the Pheonix, but with canti mounts and 130 dropout spacing), to a Cross Check.

If you're never going to run gears, go with the IRO and save some cash. If you want room for future builds which might include gears, get the Cross Check.