Moving bed or Moving Gantry(Head) (no replies)

Hi Guys,

I'm building a CoreXY printer, and using a Dual Wire Gantry drive system. [reprap.org])

But for the bed movement I'm going to go with the wire system as well for its drive, but cant decided whether to have a moving gantry or a moving bed in the Z axis.

I'm leaning towards moving the Bed in the Z, but was curious, would it be better to move the gantry instead.

Celcius1