Security token offerings (STO's) are typically regulated by an appropriate authority such as the SEC and this places restrictions on who can participate whereas an ICO is largely unregulated at this stage but is open to the public not just private or accredited investors although this is likely to change in future
In addition to your comment, I would like to add:investing in STO-you become the owner of the shares of the company that holds it.in ICO, you just get the project tokens, which are necessary to pay commissions or for internal use on the platform.Literally stands for STO as Security Token Offering.Ie by investing you get security tokens or tokenized securities.In the circle of investors, STO is called ICO 2.0. Therefore, STO is very cool. And all potential investors should more positively relate to a new type of investment.Personally, I am more interested in STO than ICO.