Business Structure

My husband and I have 6 operating businesses under one S-corp with multiple DBA’s. In light of liability and asset protection, what is the best way to structure these businesses? Should we have 6 individual S-corps with 6 different tax returns and incur all the expense that goes with that? Or have 6 LLCs that are 100% owned by an S-corp or LLC, filing taxes as an S-corp?

Thanks.