Hopefully this helps you. I own a 2020 Smash, and one of my riding buddies bought a used 2019 Prime last summer. Ive ridden it a couple of times, although not to the extent that it would classify a true trial. While I really like the Prime, and wouldn't hesitate owning one, my Smash just blows it out of the water performance-wise in my humble opinion. Obviously your local trails, riding style, and desires will be more important than a random opinion online but I'd go Smash if given the choice. Completely biased opinion of course.
As for used, as long as either bike doesn't appear abused I think you'd be safe either way. The GG frame construction is really burly and mine barely shows any signs that its been ridden (when clean of course). My buddies Prime is holding up fantastically too and hasn't had any issues since he bought it. I think he had to replace the bearings in the rear hub, but that's hardly a Banshee issue. There's a thread on here that goes into detail about the shock sag setup on the Prime and I'd recommend reading up on it if you go that route as it truly makes a big difference in how it rides once you get the shock set up right.
Again, hope that helps. Good luck.
As for used, as long as either bike doesn't appear abused I think you'd be safe either way. The GG frame construction is really burly and mine barely shows any signs that its been ridden (when clean of course). My buddies Prime is holding up fantastically too and hasn't had any issues since he bought it. I think he had to replace the bearings in the rear hub, but that's hardly a Banshee issue. There's a thread on here that goes into detail about the shock sag setup on the Prime and I'd recommend reading up on it if you go that route as it truly makes a big difference in how it rides once you get the shock set up right.
Again, hope that helps. Good luck.
