IBM analytics for Christmas Day were released and summarized; tablet owners outspent Smartphone owners. Tablet owners averaged $95.61 per order. In comparison smartphone users averaged $85.11 per order.
I tend to look on the phone while out shopping or out with friends, then I return to a site with one of my tablets to buy an item. I suspect others do the same. However, I’ve been carrying the tablet more often. A friend of mine no longer carries a Smartphone and only carries an Apple iPad mini.
The same press release suggests owners of Android devices do not spend as much money as iOS owners.
References
Alert: Mobile Traffic and Sales Surge on Christmas Day 2013. IBM. Retrieved December 26, 2013, from http://www-01.ibm.com/software/marketing-solutions/benchmark-hub/dec26.html