That is my big issue as well. I went 11 pro max, 12 mini and 12 pro max(but the 12 pro max sat in a desk for 6 months since it was just too dang big as I enjoyed the mini), then 13 pro (which was fine), then 14 pro max (due to curiosity about better battery life again).
I have a 13 mini now as backup also along w/ a 14PM. I often use the 13 mini since it’s just so convenient and non-tiring to use. But technologically the 14PM is way superior with a nice battery, so I end up using the 14PM on trips.
I think the 15 pro will be a good compromise, but just concerned based on people here with the regular 14 pro and its suboptimal battery life. Thinking I may have to order both also, hate the idea, but difficult to decide.