Now that I think about it, and don't live in the Phoenix metropolitan area, you have a point regarding traffic heading west. I think then that whichever route you choose, take it easy and don't push it. With traffic, heading west, you should be across the border within 3 hours or a little more. Heading east, you might not get as far, but from what I remember, those mountain routes are more scenic. There must be others who have actually traveled out of Phoenix both routes and could chime in, rather than my "local" knowledge, which would be relevant if you were on a time crunch, but if not, don't let me stress you, and just take your time!
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