You would need a screen protector if you are trying for full protection. UAG case was on my iPad mini 5 and the screen cracked. I wouldn't say any of them are the best because you still will have some damage if dropped.
Give us what usage for the iPAD. Is it going to be used on site of a construction? in the field? Or just day to day, carrying to and from work?
It looks like you are looking for a slim portfolio case.
I want to protect my iPad inside my backpack. Normal use. Office, house, airplane.
I don’t like screen protector. I think that the best protection for the screen is the Apple Care
Leather? I don't think it's for me the right chooce
I prefer some of most protective
I transport my iPad on backpack and I want to protect the device from bend