iPad: harder to pick up off the table than the older tapered / teardrop models.
Have you ever tried to pick up an IPad Air 3 when it happens to be lying face down on a desk or smooth surface? Not that it happens often but it does happen and it’s impossible to pick up without long fingernails or sliding a piece of paper underneath. I’m not a super fan of either squared edges or round edges other than to say a square edge iphone is MUCH less slippery than a round edge. My iPhone 4s felt much more secure in my hand than my 8.