Well, we do understand the characteristics of these two tokens, right? If "investment" is your concern, Security Token is for you. This token is purely for investment. And for the reason that- first, it cuts down the cost of service delivery. Second, given their holder access to the decision making (which is the most promising for they have the ability to issue tokens that represent shares of company stock) and thus expect returns – but, if and only if, it will properly run. Meaning, if you are willing to take the risk. Lastly, you don't have to worry about the law and regulation for this token is fully compliant with the law as what has been mentioned. On the other hand, Utility tokens which have less risk(using the platform), are "not designed as Investment". they are said to be future access to products and services "only". However, because of its number which is fixed, the bigger the network grows, the bigger the demands it will create.