SMT suits you if your product is content related. i am not sure what else can you use if not STEEM. i find myself in similar situation as you but my business idea is still too early. one thing i know is that i will go for a blockchain without fee. i did an ERC20 token for the sake of it and i realized that the transaction fee are going to be an issue in the long run. so that leaves me with STEEM and IOTA, i am not sure if IOTA can be forked. i would follow you and see what you decide. do share when you make up your mind.