I was upgrading from the 11” M1 and bought both an 11” and 13” to try for a few days in real world scenarios to see which I preferred. Mainly, my upgrade was intended for reading eBooks in dark mode before bed - which I really wanted the OLED upgrade for. Other than that, I use my iPad as a notes/general browsing device when weight lifting, an entertainment screen when doing cardio on a stationary bike, and overall around the house content consumption.
I found that with the newly reduced weight of the 13”, the ergonomic advantage of the 11” isn’t what it used to be in prior generations. In almost every scenario, I found myself holding and using the iPad in the same way despite which size I went with.
With that difference minimized, imo, I found the advantage of the larger keyboard, trackpad, and screen of the 13” was well worth it. You get used to typing and navigating on the 11” for sure, but I just found it to be a much more enjoyable experience on the 13”. With the larger size, I am also much more inclined to use the iPad for web browsing and other tasks that would have felt cramped on the mac - notably multi-tasking with two split windows.