Been to Wok in the Park twice, it's as good as Thanh Do in many ways, better in some ways. And if you are lucky, someone in the dining room will have a birthday so the staff (including the chef) sings Happy Birthday... normally who cares, but they have created a beautiful harmony unlike any I've heard before. Lovely.
I still go to Thanh Do as well, but like a good Minnesotan, when at one I pretend I don't go to the other (not that anyone asks), since I've heard there are two restos due to a family feud.
Wok in the Park