I tried out the Razr and Z Flip 4 at a store but I thought they were too hard to use while closed and way too big when open.
If you check /r/smallphones I'll post a review of the NX1 in a couple months (or whenever I get it + a week or two). It looks like the closest spiritual successor to the Palm Phone (although the single button on the foot with multiple actions will probably never be beat)