It's an interesting question, like some have said, most if not all of those ico listing websites are asking for money to list ICO projects.

So let's think about it, Project team are doing an ICO to get funds and develops their idea or in our case (see my signature) get money to spread the solution.

My point, is that if ICO projects owner are looking for money, they probably do not have money enough to get listed in those expensive listing.

You will say, most of them propose free listing, ok, been there ... more than 2 weeks ago and still 80% of the ico listing websites still did not list our project which is mature, with existing team, giving good rewards and bonus...

To summarize, I believe the best opportunities are probably hidden gems that are still in process inside those ico listing websites. And when they get published, it's probably already too late, as the most profitable bonus are off the table already ...

One exception is https://icobench.com/ico/selfpay we have been listing very quickly with them.