I usually use clipless (SPD) on pedals that are one side SPD and one side platform. I want the platform side for when I am wearing regular shoes around the campsite and want to go to the grocery store or the pub or other short trip. I also wear regular shoes (hiking shoes) if I am on very difficult terrain and might have to get my feet on the ground very quickly. I have been on some roads where there were more cobbles than gravel, on those roads I really liked the platform side.
A few years ago I wrote up an comparison of A530 pedals and M324 pedals at this link:
https://www.bikeforums.net/touring/1...l#post18306425
There are a few other pedals that work with both kinds of shoes, but I was only familiar with the two that I compared.
A friend of mine always tours with platform and toe clips. He does not want to carry the weight of a second pair of shoes, so he uses his sneakers for everything.
Another friend of mine always used platform until he hit a speed bump in Ireland last summer, his foot slipped off the pedal and he woke up when the EMTs were prepping him for a trip to the hospital. I do not know what he will be using in the future, but it might be something different.