There are several differences including:
• Storage: The mattress is lifted in an Ottoman bed using a lift mechanism while in a divan bed, drawers built into the sides or the very end of the bed frame are used.
• Space-saving: An Ottoman bed saves more space than a divan as the former doesn't need extra space to accommodate drawers.
• Drawers: An Ottoman bed offers more storage overall as the number of drawers changes with the type of divan you buy, which is not the case with an Ottoman bed.