Hello Veit Josef Schneider, that's a great question.
This really depends on who you are advertising/marketing to:
Where are they from? Male or Female? What are their interests?
We all know of the marketing area at https://www.sfimg.com/Resources/MarketingCenter.
Did you know there is also another banner page? I found it while snooping around one day-
https://www.sfimg.com/Resources/OppBanners
There are several banners here that are not in the marketing center.
I suggest you try them in your efforts and add the new JMT Gateway into your advertising as well because it is so informative.