I am about to walk out the door to go on a cross country road trip. I was wondering what was a better route from West Palm Beach to Phoenix. I was going to take i10 through Houston, San Antonio and El Paso to Phoenix. But I saw you could also take the route through Dallas and head through Roswell and the White Sands I believe thats i20. Does anyone know what is the better route to take? What are the pros and cons betwen both routes? Should I take one going there and the other for the way back?

Please reply soon as today I am leaving.
Thanks