Dropbox is simpler, has easier setup, less features, and in my experience a more reliable/quicker on-disk sync client. Google Drive has quite poor UX, which put

Dropbox is simpler, has easier setup, less features, and in my experience a more reliable/quicker on-disk sync client. Google Drive has quite poor UX, which puts a lot of people off. I use Google Drive, but I can see the appeal of Dropbox for someone who doesn't need Drive's web UI features and extras and just want something that works.