I’m in the same situation. I got my 14 Pro Max last Wednesday and set it up as a new phone. It goes on charge every night just like my 13 Pro Max, and I’m not using it differently.
The battery life so far isn’t good. I have the screen brightness set low, and AOD isn’t enabled. It also gets quite hot sometimes.
I’ll probably keep it, but the battery on the 13 Pro Max was ridiculous, and I want at least as good as that in an upgrade.