For data sharing between process using in-RAM memory files, is it /run a good place to store “big” files (where “big” means between 100MiB and 1GiB, but not bigger than that), or is /dev/shm (or use shm_open) a better place?

In my system, both /run and /dev/shm are tmpfs mount points of same size, 16GiB. /run is usually used for storing lock files and other “little things”, but I don’t know what could be wrong with using /run has a general place to store in-memory shared files.