STOs can't be promising, the are riskier than ICOs because both of them are the same thing while this new ones are the continuation of the same thing that has been going on for a while so it can attract less investors. on top of that, with ICOs you could never know when you could dump so the dumping happened slower and you had time to get out. but with STO you know it is already listed somewhere and the dump is going to be big and fast without giving you any time to cash out.