The biggest difference I can see is the inlet valve. The Microdairy does not have one. They can be VERY expensive.
I have the Microdairy vat. I do not need the valve. I pour my milk into the vat and scoop the curds out.
I guess if you are piping milk from barn to vat the valve is needed.
I can not find a price for the Jaybee bit the microdairy was $12,000.00 last year.