I definitely enjoyed the 5th at Royal St. George's. The tee shot is more strategic than the one at Prestwick, and the second shot approach through the gap in the dune is very cool as well. While the green there is barren, it is still filled with interest. However, Prestwick wins on account of the greensite, which is more intricate than the one at RSG. Furthermore, Prestwick's gaping Alps bunker suffers no fools, whereas Sandwich gives up a duff or two, contrary to the heroic nature of the Alps Hole. I vote Prestwick.
Mark S,
The Alps at RSG is the 5th, not the 9th. Both are fine holes in their own right, and your score on the hole is an arbitrary and ultimately poor way to judge the hole's architectural merits. I'd love to hear your thoughts on the architecture at RSG's 5th.