Great shots! I'd guess Broad-billed male, passing from immature to mature plumage. Here's why.
First, while both Broad-bills and White Ears are rare in Arizona, the Broad-bill is a little easier to find.
Second, the Broad-bill has a bit of an indented shape to its tail when the feathers are spread open. The White Ear's tail looks more straight across.
Third, the Broad-bill has more white underneath the tail than the White Ears do.
Fourth, the photos show emerging blue feathers on the side of the neck below the ear coverts. The White Ear male has blue on its forehead instead.
The area between Tucson and Sierra Vista is the hummingbird capital of USA. I suspect that the unusually dry conditions in Arizona this year have made the backyard feeders even more attractive to hummingbirds of all types.