It depends. I use 4 sizes on Games and Casino, depending on where I put the banner. Other sites I use other sizes.
Poker I like male oriented colors and images, slots female. But then more and more men appear to be into slots these days so….
I definitely like specific game oriented banners with actual games depicted.
It’s just hard to say. When there is a wide selection like you have now there is never a doubt that I will walk out with what I came for.
Many programs, including some large microgaming programs, I will visit and I will leave with – nothing, because I didn’t find what I was looking for. That can work in your favor… you’re the program that always has the right banner for the job.