Personally I have no experience with Orsonic, which makes multiple models, A cursory look at Google returns show an AV1s, AV1b, AV101s, AV101b, AV11s, and Av11b. I don't know the distinctions, and the eBay listings don't seem to differentiate either.
The AV101 series cost about 50% more than the AV1 and AV11 series. I notice that the included cartridge leads are not as nice as the ones included with the Sumiko and ZuPreme headshells. But that doesn't tell everything.
I do know that the ZuPreme is slightly lighter than the Sumiko. I have a 6.5g cartridge on my Sumiko and an 8.3g on my ZuPreme, and yet the overall weight of each assembly is the same (21g). I don't have to reset zero balance when I switch, which was a happy accident.