Well, if the units are well-designed, a pair of Y-connectors will be fine. This means that the dac has a low output impedance and decent current output and that the two loads each have a relatively high, constant and similar input impedance. I do not know any those devices, so I cannot advise further.
A switch, of course, will do fine, too.
Kal
A switch, of course, will do fine, too.
Kal