I'v been both ways many times, I like memphis route better although a little longer, most road const. near oklahoma city was complete when I went thru in march, going Oklahoma way you have rt 66, going memphis way you get the blues. I'm sure others have more info on roads, but as I remember both were fine a few months ago.
Bob, Julie and Izzy (Usually on all 4)
2008 Gulfstream Gladiator, Super C Toyhauler
2007 Chevy Suburban LTZ / Readybrake.
2010 Harley Ultra Classic