Wow. Look pretty in either container!!
But maybe the slab could allow for some clever ground cover/secondary planting ala Arthur Joura or Wally Paul?
Have to figure that would take a little more planning/acquiring material. So maybe best to look forwards to the next re-pot when a more informed/defined presentation becomes clearer.
Only limited exposure/experience with containerized Beech, so I'm curious as to how aggressive your "root hand" can be at re-pot? Seems to be quite the mass here...
Looks slab-tastic!!!.........but I like this iteration as well...