From my recollections, it seems Myrtle Beach is where many, many Canadians/Irish/Scots/English come for a golf holiday. They love the distinctly American GCA experience in MB, the cart loaded with 'refreshments' and especially, especially the 'cart girl'.
MB would also provide a wide array of modern American architecture, all in one place. Doak to Dye to Love to RTJ to Palmer to Cobb to many others.
On the other hand, Philly area would be best with Flynn, Tillinghast and Ross, etc.
But, one course, modern era, I would pick the Dunes at MB. Classic Trent Jones, modern post WWII with a dash of lateral hazards, forced carries over water, and the American use of water for strategic design.