New guy finishing off a mini mill build

[JAZZCNC]

Mach3 is an aging dinosaur and Mach4 is full of bugs so best avoided.

The other suggestions are ok but come with their own little traits, like Linux CNC having a steep learning curve for anything more than basic usage. The centroid acorn is a good choice but like been said watch out for the hidden gotchas with the software if you want ATC etc. Cslabs controllers are good but their own software is rubbish and they don't support mach3 anymore only mach4 and that's crap.

My choice without hesitation would be UCCNC and either AXBB-E or UC300ETH motion controller. I've recently changed from years of using Mach3 and fitting various controllers to machines I build, inc Cslabs and I can tell you with complete confidence that UCCNC now knocks the spots of Mach3/4 and is rock-solid stable.

The Motion controllers are of good quality and work well, the only gripe I have is that the motor outputs are not differential, but other than that they are well made and supported. The AXBB-E in particular is a very neat and capable little controller.
CNC Drive is very good with support and obviously because they make the software it's fully supported and any bugs fixed quickly.

The combo of Software and hardware just works straight out the box without any fuss or messing around which isn't always the case with some setups.