Never heard of the Routakit before, but it's along the same lines as an Ox. Meaning very lightweight hobby level machine.
Don't buy a machine based on what electronics it comes with. Buy whatever control/electronics that you want, separately.
While Planet CNC is arguably better than Mach3, the G540 is much better than the Planet CNC Drives that come with that kit. But it's 3x the price. The Leadshine M542 is a good mid-range drive. Also look at UCCNC as an alternative to PlanetCNC.
If you can afford $1000 more, get a Fineline Saturn, which is leaps and bounds better than the standard Fineline.