[Zubersoft]

I can't speak to whether the upcoming Samsung Tab S8+ (12.4") or Ultra (which will be over 14 inches in size) will be viewable in outdoor lighting, but those could be very much like the iPad Pro. You also could consider one of the BOOX e-ink tablets if you wanted something that would be easy to read outdoors. Alternatively, I'm also working on an iOS version of MobileSheetsPro, so you won't have to wait too much longer to be able to move your library over to an iPad if that is your preference.

Mike