Cabo
Why would you want to do this?
I have been to both props at least 3 times,
I can not imagine what are you seeing in one place that you think you will miss out on if you dont go to the other?
beaches are the same, food is similar, style of aritecture is radically different but they are both on the exact same street just a few miles apart!
why in heavens name would you waste a half day of hard earned and fairly expensive holiday to pack up your stuff and schlep it to another place and unpack it there
pick one and enjoy your stay, let me make it simple, if you have kids and/or plan leaving the resort and go into town every day stay at the sheraton as it is a long walk up a fairly high hill from westin's rooms to the lobby
otherwise just go and have fun