I would choose either yellow cake with chocolate frosting or chocolate cake with whipped cream. I love chocolate, but as I’ve aged, my taste has changed and all chocolate is often just too rich. As a kid, we always had what was called blackout cake—chocolate layer cake with chocolate pudding filling and chocolate frosting, covered in chocolate crumbs. As others have mentioned, I also love Black Forest cake!
But I don’t care to eat much cake anymore, and I’m not a fan of buttercream frosting unless homemade, since most commercial bakeries (especially in big box supermarkets), make it with shortening, and little or no butter.