Thanks a lot for your thoughts.Amazon DRO I have this on both my Smithy 1324(don't judge) and my mill.
Get two DROs. You don't want to keep moving head units back and forth because you will have to calibrate the scales on each unit, and that is stored in the head unit.
if you can only afford one, Learn to use the dials on the lathe, DRO on the mill first.