Good comparison from Mark Linsangan on two of the best three keyboards for iPad Pro:
If you’re the type of person who lugs around their iPad Pro everywhere and you want the most minimal looking keyboard case the Apple Smart Keyboard Folio is what we recommend you pick up.
I cannot disagree.
However, if you’re willing to give up that ease of use, lightweight and slim form factor and you care more about how the keyboard feels, want some added protection, and you want to maximize how you work then you should pick up the Logitech Slim Folio Pro.
What about Brydge? Lori Gil:
You may not be on board with the additional weight that the Brydge Pro adds to your mobile usages. This keyboard is meant for people that work on their iPad Pro, not for people that use it more as a tablet.
It doesn’t take much of a keyboard to make iPad Pro as thick and bulky as a Mac.