It is not necessary to specify which type of advertising is better. It is necessary to use all the available advertising options, and then the results of the ICO will be more positive.
I think if someone wants to promote their product, they need to use all sorts of ads that may have to quickly attract people.
It does not seem like a good idea to attract investors, but the main factor influencing investor expectations is market activity, the main factor that investors react to a finished product.
If the team spares no effort and money for advertising, investors are sure to be interested in the project and buy its tokens in large quantities.