Since they are available locally I assume that you can actually listen to them even if in very different systems which of course would complicate the matter.
Also while you are visiting the dealer try to work the tables and arms by yourself to get a physical feel fot the things. It might just come down to your preferences. Nottingham sounds big, emotional and confident; a little on the warm and dark side of neutral. Spacearm will not like heavy low compliant moving coil cartridges.
I have original Spacedeck/Spacearm and like them a lot. Not familiar with Wilson Benesch. My system and music I prefer are quite different from yours.
Also while you are visiting the dealer try to work the tables and arms by yourself to get a physical feel fot the things. It might just come down to your preferences. Nottingham sounds big, emotional and confident; a little on the warm and dark side of neutral. Spacearm will not like heavy low compliant moving coil cartridges.
I have original Spacedeck/Spacearm and like them a lot. Not familiar with Wilson Benesch. My system and music I prefer are quite different from yours.