I was considering going Pro size this year (I have been using maxed size since they first arrived), so I pre-ordered the DP Pro and Pro Max. After some thought, I cancelled my Pro order today and staying with the Pro Max. I do prefer the bigger screen and extra battery life, which is likely to go through fewer charge cycles, so there is less degradation. My iPhone 13 Pro Max is at 199 cycles after one year, and battery health is still 100%. The 20% - 80% is a good rule to follow, and even charging it to 100% frequently is not really an issue on battery health. I charge (short charges) my phone multiple times throughout the day: when I'm in the car, at my desk etc. I don't charge overnight, though. Two things kill the battery's health: heat and constantly draining the battery down to 0%. Heat accelerates battery degradation, and that is why I don't really fast charge or use wireless charging: it kills the lithium-ions a lot faster. I avoid using intensive apps while charging to help keep the phone temperature low. Avoid leaving the phone in hot environments also helps: such as under the sun, especially during the summer.
My choice to remain with the Pro Max size was not just due to the larger screen and extra battery life but also how I use the phone. I do recommend that anyone who is on the fence between the two sizes think about their use case for the phone and the role it plays in their daily workflow. The iPhone is my primary device and one that I use a lot more than my MBA and iPad Pro every day. A lot of my daily workflow depends on it, whether that be work, leisure or managing personal stuff. I consume a lot of content, and the larger screen improves the experience. I don't reach for the iPad Pro unless I'm at my desk; it's stuck on the Magic Keyboard always. I only use my MBA for work and serious productivity tasks. The iPad Pro is reserved for some light work, browsing, media consumption and photo/video editing. This leaves the iPhone as my most used device every day, the Pro Max is a better fit for my needs despite the compromise on size and weight.