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I started out with linear scales connected to a Mesa interface card into a computer running LinuxCNC. The LinuxCNC display replaces the dro head and has all the capabilities and more.?

I added stepper motors (which gives me more features than a powered axis). I went with closed loop steppers and in hindsight I could have gotten rid of the linear scales as the stepper driver alarm gets set if the mill goes off course. I wouldn't omit scales with open loop steppers but I would with closed loop steppers which are probably cheaper than open loop steppers plus scales. Closed loop steppers are about $100/axis which is competitive with powered axis.

I recently added a tool touch off sensor and a probe so I can accurately locate work and change tools which is a major accuracy improvement and much easier. Not available with DROs.

If you do go with linear scales, there are cheap scales available that have an index signal (along with the AB quadrature signals). The index signal can be used as a very accurate home signal. I've seen this pin label R or I. If you don't have this signal your linear scales will be relative to whatever you use as your "home" signal which could be a microswitch. It's going to be more accurate if you have an index signal synchronized?to the AB signals.