I don't think there'd be much of a difference, if at all. Usually differences come from the core and WU that the client uses; they'd probably be the same in this scenario. All else being equal though, I'd probably run the x64 version just because
I don't think there'd be much of a difference, if at all. Usually differences come from the core and WU that the client uses; they'd probably be the same in this scenario. All else being equal though, I'd probably run the x64 version just because