The problem with Parker is its size: ~3000. Yuma OTOH is just shy of 100,000. Yuma has an airport with commercial flights (American Airlines) connecting to Phoenix and Dallas-Fort Worth. Yuma has a hospital (Level III Trauma) while Parker's is Level IV Trauma. Yuma has a nearby casino and apparently has an up and coming
regional Arts scene. If you're only looking for a place to escape cold winters, it would seem to fit the bill. We pass through Yuma frequently to visit family in San Diego. Over the twenty plus years years we've been doing that, it certainly seems to have grown especially as a snowbird haven. We have our dream home in Sedona so we won't be moving there but for others it might be a good option.