I’ve seen/heard some good reviews for the newest Brydge keyboards. The one for the iPad Pro 11 is going for about $150 on Amazon if you are a Prime member.
However, while it attaches to the iPad, it is not a case, and it is Bluetooth, not the smart connector.
On the other hand, it has several special function keys that are not on the smart case: brightness, volume, and best of all a keyboard key that lets you bring up the touch keyboard even when the hardware keyboard is active. That can be handy.
I prefer the smart case on my iPad Pro 12.9 because it’s lighter and never needs charged, but admit to some envy when it comes to those extra keys.