It is not really the same question is it? I am looking at buying one of the 3 devices (Moto X (2014), Moto X (2013) or the Nexus 5) during the Black Friday weekend. I will buy the one that has the best deal.
Are you looking for off-contract deals? I just upgraded to the Moto X+1 (2014) on AT&T from Best Buy and the phone only cost $1. If you're looking for off-contract, that's a different matter.
Last year, they sold the 2013 Moto X for $349 off-contract, so I'm holding out and waiting to see if they do that this year for the 2014 model. Otherwise, I'll purchase through Swappa.