Is there an particular exchange that STO tokens are getting listed or are the Security tokens going to also be listed on known crypto exchanges like bittrex?
I'd like to see list of security tokens

Are they're going to be more valuable than the regular Utility tokens?
Some are already list in exchange like hotbit,GARD token is an example, you can check it out.
It terms of value, I don't think they will be more valuable, but you are rest assured that your funds are not invested in scam when you buy into STOs.
We all know the high scam rate in ICOs.