I don't have to use differential. The Behringer DCX outputs may be strapped for single-ended operation.

Use of differential would allow me to place my amps very near the speakers, away from the electronics rack. If I did that, then I'd have line level signals running 15 ft or so, and noise pickup could become a problem.

This positioning is appealing because the speakers are tri-amped, so there is a lot of unsightly 12-ga wire running across my listening room. If I used the differential line levels, I could tuck small guage wire under/behind my baseboard moulding.