Do you think Bitlattice is better than holochain at present?
Yes. It is. It has a different structure on which all operations are performed (casted). Holochain is actually a pretty smart multichain, but still variation of a known scheme.
but still variation of a known scheme.Can it be explained simply？
Multichain is a known scheme - used in variety of projects. Holochain has distributed hash table that stores hashes of child chains. Not very new approach, but nicely done. BL differs by using spatial distribution to deal with computational and storage constraints.
I do not see any relation between "computational and storage constraints" and "storage of hashes of child chains".
What does "using spatial distribution to deal with computational and storage constraints" means? Could you elaborate on this?