Assuming both can be bought here through single-shot exemption (Sphinx has 10-rounders available as well), which pistol is superior in terms of features and ergonomics? I'm aware that one is much more expensive than the other, but if we could ignore that just for the sake of discussion that would be great. The only pistol we can judge with regard to reliability would be the SDP since it's been on the market for about a year now, but all the specs are readily available for both. Which would you get?
R51
-No thumb safety
-Lower bore axis
-Pederson device (locking breech block)
-No sharp edges
-steel frame
-SA only
SDP Compact
-Higher capacity
-Interchangeable grips
-Aluminum upper/Polymer lower
-Longer barrel
-DA/SA
-Decocking lever, 6 safeties
R51
-No thumb safety
-Lower bore axis
-Pederson device (locking breech block)
-No sharp edges
-steel frame
-SA only
SDP Compact
-Higher capacity
-Interchangeable grips
-Aluminum upper/Polymer lower
-Longer barrel
-DA/SA
-Decocking lever, 6 safeties

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