I am moving to Washington DC by the end of this month. I am thinking of making a round trip of it. I will be having 7 - 9 days. I will be taking I-17 from phoenix, then I-40 till Oklahoma city. From there I am looking at two routes.
Route - memphis, nashville, knoxville to DC.
Route - st.louis, louisville, lexington to DC.
Except for DC I have never visited any of the cities mentioned above. I am leaning towards route 1 so I can visit the Great smoky mountains NP? I would like to take the easy route, considering road conditions (prefer non-mountainous), traffic, weather etc. Any suggestions on which route to take?