It is hard to compare these two in many respects. The machining on both is of the highest order, both companies have a great deal of flexibility and speed in design adaption, and the design of each is very innovative but with significantly different focus. Spuhr is very much the opposite of quick release. It uses four machine screws to mount. The ARC can be used either as a quick release or not. Spuhr is heavily geared to attachments. They have a comprehensive system with little screws complete with length gauges so you know they won't go through into your tube. The user can choose virtually any kind of desired attachment and attach it virtually anywhere. While the ARC does have an integral level and an attachment point for an angle cosine gauge it does not feature the variety or quantity of attachment points of the Spuhr.
In the end I'm not sure these two scope mount systems are all that similar except in that they both do a good job holding a scope in place. The feature sets are very different. If you want to mount the kitchen sink to your scope you will need the Spuhr and if you want to mount and un-mount an optic quickly you will need the ARC. If you don't care about, or use, either of these features than you can't go wrong either way.
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