SME Model 20/12 versus TechDas AirForce V or Suggestions for a 2 tonearm TT

I have a Model 20/12 TT with a 312S tonearm. Some time ago ( a long time ago, in fact) I ordered a Schroeder CB-L tonearm. However, as Franck Schroder is very busy, it took a long time to fulfill the order.
in the mean time, as I didn’t believe that I would get my CB tonearm anymore, I had the chance to buy a Graham Phantom III 12” tonearm. This week, I got the good news that finally my tonearm is ready. So I am faced with having 2 top notch tonearms to use, having a TT which accepts only one.
My audio dealer offered me an almost irrefutable business to exchange the SME 20/12 with its 312 tonearm for a AirForce V TT, which allows for two or more TA

The V has more technology but is not well isolated as the SME 20 I wonder what is your opinion about the business and if anyone has listened to both tables with same tonearm and cartridge to compare