I've started building custom pdf planners for these eInk devices (I'm an rM2 owner myself) and am always looking for insight on how people use them. Have a little website setup for this at https://hyperpaper.me
The TODO lists I mark with Done, Won't Do, or Rescheduled for the future. That process is valuable, if I push something off too many times, I evaluate if I really need to do it.
I started with the Panda Planner Pro, but I ended up finding the personal and reflective things more onerous than useful. So once I filled up the first one I moved to the Amazon Basics Daily Planner ( https://www.amazon.com/gp/product/B078GVYRZG/ref=ppx_yo_dt_b... ), which I mostly like. I like having two days of todos at once, because I can just see more that way. I'd probably be just as happy to have 3-4 todo columns per 2 pages, 5 would be convenient but probably too small.
I'm considering the Clever Fox Pro for the next one, but it's $40 while it has a nice week view, it probably doesn't have enough todo entries, I really need a good 10-15 per day. Maybe I just need a week todo, with daily "priorities". That would probably be ideal.
I'd like to try the "timeslots" where I plan out my todo a bit more with times, but that may or may not work.