I don't have any experience with the Origin tonearms, so can only offer one observation. The JMW arm on the Prime has VTA on-the-fly. I consider this the single most important feature any tonearm can have. Even a minute adjustment can make a huge difference in the quality of playback. This is because no two records are precisely the same thickness; that makes any fixed VTA adjustment an inherent compromise. I have fooled around with the VTA feature on the JMW and found it to be smooth, easy and repeatable. Precisely what you want. The VTA on my Graham is a bit too stiff for my liking, but holds the setting perfectly and really lets me dial in the XX2.
I'm personally pretty picky on this stuff, so may not be a particularly good touchstone for you on certain fine points. I believe that the cartridge has to compliment the speakers, the tonearm has to allow the cart to perform to its maximum capacity and the table has to spin reliably, precisely and silently. Bear in mind that the beauty of tables like SOTA and VPI is that you can change arms & carts freely to find the synergy that pleases you. I like the SOTA approach to the table, but given the choice you've presented, I'd tend to favor the VPI because of the arm that's on it presuming everything else is equal.
Note that the JMW is not an easy retro-fit to SOTA; requires modification of the plinth. Not something I'm in favor of. That means VTA-OTF options for SOTA are reduced by one very good tonearm manufacturer.
Like I said, I'm picky so these things are important to me. Consider how important they may be to you. None of this stuff is cheap and you want to make sure you get something that makes you happy for some time to come.