My fiancee and I live in Philadelphia, PA and have family moving to Phoenix. We plan to take a 12 day trip and want to spend atleast 6-7 days with them. That leaves 4-5 days to cover the distance since one day will be spent at the Grand Canyon. We're undecided on which route to take and hope to hear suggestions. We'd like to enjoy a scenic route, soak in some culture and visit landmarks.
Option 1 would be west on the I-70, stopping at Pittsburgh, Columbus, Indianpolis and St. Louis then taking the I-44 south to Oklahoma City.
Option 2 would be south on I-81 to Knoxville then west on I-40 to Nashville, Memphis, Little Rock to Oklahoma City.
The difference between the two will be about 150 miles. Once we get to OKC, the route will be the same: Amarillo, Albuquerque, then spending the night in Flagstaff. We'll have an early start the next morning and visit the south rim of the Grand Canyon, spend most of the day there, then make way towards Phoenix in the evening. We have never been to any of these cities and any input and suggestions would be apprectiated!