If you really want to get down to it, the head has nothing to do with the "dome" as you said. The "dome" is part of the piston, not the head. The BOWL is what you are referring to and the bowls themselves are almost identical with the exception of the added quench area on the GSR head. The added quench are will not only help raise compression .3, it will also promote better flame travel. Its a simple classic pent roof style combustion chamber used back in the 50's and 60's.

One can argue all day long about the flow of these two heads, but are flow bench numbers really what "tells all"? The B16 heads use earlier casts and if you compare the B16 with a GSR head side by side you will see the differences in casting. The GSR head uses a newer casting and has less shift and is therefore a LOT cleaner. Not only that, but Honda learned something that they incorporated into the GSR head, higher intake ports. The higher ports provide for a more direct flow of air from the intake manifold. Something a flow bench won't show. Just remember, people can do as many "test" as they want and post up charts and dynos left and right. Sometimes it takes a little more common sense then just how to read charts in order to see some of the advantages one piece might have over another.