The 10 vs 12 would be a Mass question in terms of cartridge matching. Also some cartridges work better in 12inch arms than 9 inch. I haven't but I would bet a cartridge that is very low compliance will benefit on the 12 inch. The Kuzma is reported here to prefer very light weight & light VTF cartridges. Correct me if I am wrong.
I believe the mass of the arm, not necessarily the lenght, has to be matched with the compliance of the cartridge. I used a Kuzma with a medium compliance Koetsu Jade with excellent results. I would speculate the 12 inch is smoother sounding than the 10 inch, due to less tracking error.
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