I have historically used the Apple Brown Leather case, on my last 3 iPhones. I loved the way they broke in with a beautiful dark patina. And as I've had Max phones the last couple, the case also helped me hold onto it better. The slickness coupled with the rounded edges made it feel like a bar of soap sometimes, and it was almost NEVER a one-handed phone for me, or really anyone with remotely normal sized hands.
I recently got a new Chevy Tahoe, and it comes with wireless charging and CarPlay. and the charging doesn't work through a case, so I've been pretty much naked for the past couple of months.
I got a 12pro, and it really feels like the perfect size for a phone IMO. Lots of screen real estate, but still a one-hander for typing with swipe. and with the hard corners it is so much easier to hold onto. So I'm staying naked, unless I head out hiking or skiing and the I may throw on a silicon case.
I'm sure the 12 pro max will also be easy to hang onto, but that size is just not efficient for me and my use case. YMMV.