Nexus or Nest?

Trying to decide what to ask for for a Xmas/birthday gift. I don't have a tablet, but do have an iPhone 5 and have had an android phone in the past and would like to get back to it since its been a while. But I am also intrigued by the Nest Thermostat, but I live in a relatively small (~1000 sq ft) apartment and don't know if I'd get the full use of it, although I could always take it with me wherever I go. Both are about the same price @ $250, but I can't decide which to ask for. Thoughts?