You may also want to look into the Zoom stand-alone multi-track recorders if you plan to go that route.
One difference between using a computer vs a stand-alone recorder is, a computer is and can be way more powerful, as powerful as you want to be...multiple cores, ram up the wazoo. You can run more FX's, audio tracks, midi tracks, using hand picked VSTi's & FX's of your own choice. Also a computer will allow you to use any interface you want with the type of connectivity you need, and you can also use multiples of some interfaces if the extra I/O is needed.
Unike a computer DAW, if you're going the all-in-one stand-alone recorder, you're fairly limited from the start, so I wouldn't even concern myself with what 'sounds better in a final mix' at that point. It'll at least be good enough. But the again, if the stand-alone solution meets your needs otherwise, then all is good.
Even IF there's a keyboard/workstation in existence that can record audio tracks, don't be expecting anything much more than these stand-alone multi-track recorders, as they certainly will be just as limited.