Looking at the specs the JX was a higher end mower compared to the JA. Kawasaki versus Briggs, more speed selection on the drive, etc. But if you pay more for it then need to start by putting a blade clutch which looks to be around $100 for a new one you might end up better off going with the JA.
Also the question of hours of operation on each which is always hard to tell.
Also the question of hours of operation on each which is always hard to tell.