For a couple of selected series I choose to watch them in 1080p. For the rest I usually go with 720p because of the smaller size. It's a good compromise I think.
720p on laptop (because resolution + filesize) and 480p when I watch from phone, while my phone resolution is fullhd (1080p), the phone small display doesnt show any noticeable difference between 480p wtih 720p or 1080p
I go as high quality as possible, but I'll settle for anything as long as it's not too terrible; too lazy to search for high quality if I've already got something okay lol