Well hopefully Epic can reply to you on the matter then 
I prefer lower level to save as much space as possible on the HDD
But once again,
Thank you for posting your research on generating dynamic meshes!
Your research saved me a lot of time!
Here’s a pic of a UV-Mapped generated Torus Knot with collision, that I made in-game, and the process was vastly sped up because you shared your research!
Rama