I looked at both of those as well since I'm needing a stand. I like the Nashbar brand because it gives you more flexability as to where to mount your bike to the stand, i.e downtube, top tube, or seat tube. The Spin Doctor model probably holds your bike very well but it looks like you always have to mount your bike to it in one of two ways, and each of those ways requires removing a wheel. If I had to choose between the two, I personally would go with the Nashbar brand.
Scott scale 29er, Gary fisher Rig SS 29er, Fuji Cross pro, Novara Randonee, Scattante TI custom build, Fuji Team
im looking at buying one of these two as well. Im picking the Elite (same name as the G3 pro on the performance website) because they have onein the store I was able to check out. Im not really sure about a stand that is holding onto the fork and BB, and the tube clamp of the Elite looks and feels solid. The G3 Pro is the same price (and the same as the elite) but through the Performance website... whatever has the better coupon (plus 10% back for performance membership)
I have the elite version....works just fine. Since it was a gift I didn't choose it, but after using for a few years now, I'm pleased. Makes me wonder how I survived all those years without a repair stand. So much easier than leaning the bike up against the workbench only to have it fall over on me while I was working on the crank, pedal, or whatever.