I know more about the RPI, but its a full linux system, so there is admin stuff to do there (updates, backups) but I know very little about Arduino, is it a full OS, does it need admin attention or can it be just a data converter /collector for the PI, meaning I have no extra sysadmin duties? Also power consumption PI3 vs arduino? I also have no idea which draws more power, a PI3 or the appropriate Arduino for the project.
the mastodon instance at cybre.space is retired
see the end-of-life plan for details: https://cybre.space/~chr/cybre-space-eol