Either you find a hidden gem exchange that also has its own exchange token or stay with the top exchange token as you have listed.

Sometimes luck will permits you to invest with hidden gem, depeends from how you see the potentials of such particular project.

Don't bother anything else since there is a lot of bad exchange with nothing to offer for their in-house tokens.

You have to read more about the project and if this utility coin have a good real usage it will turned valuable you have to do your DYOR

Those is very high risk and not much different than ICO cause very data can be manipulated by them, in their own exchange.

This is the actual risk that you always needs to take place, reputations and the trust from the exchange who's offering the project.