I am a traveling Sales person, so I really need a computer where we people can sign their orders on to the screen. That is why I need to buy a touch screen computer. But I cannot decide on which one to buy: Apple iPad or MS Surface or another one? Which do you think I should buy and why? Thank you all.

P.S., I like Apple iPad more because it seem to have more cache and I like Microsoft Surface more because it costs less. But otherwise all I do is via our Web site.