http://www.jonesbikes.com/jones-plus-swb-complete-bicycle/
Podcast
https://www.behindthehandlebarspodcast.com/podcasts/2018/4/18/ep-31-jeff-jones-jones-bikes
Not sure about the 'DWB or LEB' but I own a Clementine and a Jones Plus (original, now called LWB). I also have a Saluki which is my daily rider.
In my opinion the SWB vs a MIT Atlantis/Appaloosa is a closer comparison than it may look. There is allot of riding philosophy that lines up really neatly between both companies. The starting points are just very far apart. Riv starts with the original BOBish/somewhat retrogrouch aesthetic with a commitment to an all rounder that can be built to suit, Jones comes from a competition minded, or at least very high level mountain biking with a bike designed from the tires up as a fully integrated package that happens to accel at many forms of bike activity.
But to really boil it down I'd say if you have a use or like the idea of 3" tires and disc brakes go for the Jones, if you aren't sold on those two elements or can't live without the sweet Riv aesthetics go with the Riv. Both bikes certainly will do way more than what most of us are capable of anyway.
Or go my route, keep the Sam (Saluki in my case) set up more pavement oriented and get the Jones as your off pavement primary... Then ride both on everything and have fun.
I will say that a Jones with 2.35" slicks would probably be my desert island/one bike if I ever had to choose. Especially with the unicrown fork so I could run a front basket... Oh and at $1800 complete the SWB Jones is practically in Clem territory price wise.
Tony
I like the observation of approach. Jones comes from design from suspension mountain biking and Grant from road racing with a retro grouch aesthetics. They seem to converge in the same space for design with a few variations, disks being one.
I had a Clem. Stable. Boring. Got me to work just fine.
Atlantis was decent, stiff and overbuilt for my use and weight. I do miss it. It fit well.