A relatively inexpensive digital mixer will be much cleaner than an inexpensive analog mixer. And if you use outboard A/D converters, cleaner still, since one place manufacturers cut costs in the A/D department. You may find that an analog mixer sounds "better" than digital or vice-versa. For myself, I went with a hardware digital mixer for other reasons: 1) having a central place for A/D - D/A conversion 2) multiple routing options -- I use a pair of analog outs to drive my headphone amp, another pair for the monitors, and record using one set of digital outs, and I route an RTA/EQ through parallel digital I/O and an ART preamp in via analog...and as needed I can route in a DAT or cassette or reel-to-reel or CD player (all of which I have had occasion to do in the last month) without disturbing the headphone amp or power amp connections -- this does not exhaust all the possiblities 3) manual control over levels & panning (this is important enough that I added a Tascam US428 for hands-on control of the software) and 4) it looks cool sitting in its rack!
A digital work station is a self-contained mixer/I/O device/hard drive (usually) recorder that does everything in one box. The advantages are portability and user friendliness; the disadvantages are limited drive space and displays that are pitiful compared to a full size computer screen.
Finally, as for "quality": this has caused a lot of controversy and my own take on it is that I am sure that high-end analog gear will outperform non-high-end digital gear (which is what I have). BUT I can't afford it, so I'd rather concentrate on getting results with what I have than on debating the relative merits of multi-$K consoles and tape decks. I think anyone starting out now should be using digital gear because it's the future of recording, and the gear will only get better, and you might as well learn how to use it from Day One...I spent 30 years recording with tape before I got a computer, and being an old guy, watching me stumble through the manuals was not a pretty sight! Harking back to the first line of this paragraph, good digital stuff will get you 'way further down the road than low-end analog.