T wrote:
The Dell is shiny glass, I have problems with that (reflections) and
direct sunlight on the iPad.

Not if your eye focuses on the display rather than the reflection
(which the human eye does extremely well, unlike a digital camera). I
tried an anti-glare foil once, but decided it's better without.

How do they both fare with sunglasses or polarized lenses?

I don't have polarized sunglasses, but my cheap ones do very well with
the Streak. Cannot see a thing on the Oudie, with or without glasses.