Do search on relative merits/demerits of lonmger and shorter arms here on at the Asylum.Certain principles of physic say 12 should be better and others thaty a 10 or 9 inch is bter.Know that Stereophiles Fremmer prefers the priciples of shorter arms.A number of factors like rigidity (everything being equal otherwise),azimuth etc come into play.There are two camps but interesting reading when choosing.I have a 12" VPI Memorial and am going to swap decks amd get one of their 9" arms though must admit the biggest difference is tht I'll lose VTA on the fly but there are differences.
Regards
Chazzbo
Regards
Chazzbo