When the 2019 iPad Air 10.5" was announced, I thought it was a decent product, but really just a 10.5" iPad Pro Lite. Then I checked the refurb store and discovered Apple was selling the 2017 iPad Pro 10.5" for even less money, so I bought the iPad Pro instead.
The iPad Pro has a slightly slower SoC (A10X), but it has a better screen with ProMotion for 120 Hz and lower latency, quad speakers, higher resolution rear camera with larger aperture + Focus Pixels + optical image stabilization + 4K recording, rear flash (and flashlight), and 4 GB RAM.
In Canada, the best deal on the 2017 iPad Pro 10.5" is Apple's refurb store, but in the US, there are some excellent deals at retails stores. Also, for those looking for Face ID and screaming fast SoC, the 2018 11" has also gone on sale in the US at some retailers.