I own 3 editions of the WTC, which are Dover, Henle, and Wiener Urtext. They're all urtext, but each has its strong points.
Dover is a completely unedited facsimile of the Bach-Gesellschaft edition, no fingering, no tempo markings (though there are recommendations from the English scholar Tovey), nada, nothing. It's a great value...you get books I and II for around $15.
Henle editions can always be counted upon for crisp, clean engraving. The cream-colored pages are easy on the eyes...and when you're ripping your hair over a fugue for hours on end you're going to want that. Includes minimal fingering markings. They only sell the two books separately, so the whole set will run you about $60.
Wiener Urtext can be inconsistent when it comes to clarity, but it's usually quite good. You will usually find more fingering in WU editions as well. But the real reason I buy them is for the critical commentary in the back, which is always fantastic. WU editions are slightly less expensive than Henle, but not by much. I think the WTC goes for $25 a book now.
The Bischoff editions of Bach are always celebrated in the pedagogical scene, so that is another edition to think about. I believe Kalmus publishes them. However, I'm unsure if this is an urtext editions or not.
Topic: urtext bach