Have you done a Phở-off? I've done a similar thing with Pizza places around me and discovered that my tastes were different when I ordered the same type of pizza pie and had them all at the same time, compared to what I preferred in the restaurant. Might be worth a try
That's pretty hard/impossible to do with Phở as the noodles will degrade pretty quickly. I'm hoping that go 3 times to a place spread over time will help average out the swings in my tastes.
Maybe one day you can write a book like Ivan Orkin did with Ramen :)