The Epic Evo isn’t that different from the Epic, and they are easier to find. The shop might even let you swap out the cockpit to simulate the Evo short/wide setup.
As the biggest difference between the Epic and other dualies is the brain, taking one for a spin will give you a good indication of how the rear suspension platform rides.
The SB100 should have no faults whatsoever, as it’s a premium product at an extreme price. However there are recognised issues with creaking / stiffness and it’s the first year in the new design with a rear end that sounds like it needs sorting out.
I found a shop with Epics and test-rode one for a full day before buying an ex-demo and building my own Evo up to preferred spec. Reward the shops that recognise the need for test-rides, and we’ll all benefit.
A final point against the high-end SB100: I suggest that regardless of where the market is now, it will move ahead in two years, and a new mid-range 2021 steed will trump keeping a high-end 2019 bike. So you’re better off not over-reaching right now to the top-spec, and you’ll be better placed to spend $ on events, holidays, repairs, and future upgrades / rotation.