I use Google Drive, but I'd switch to Dropbox in a flash if they offered 100GB pricing package. Mainly because I find the Dropbox app more reliable and syncs quicker than GD. I've had Google Drive or "Backup and Sync" or whatever they call it now crash a few times as well.

But I'm sticking with Google Drive for the time being, I really cannot justify paying £6.59 a month for 1TB of storage, when I'm prettty certain I'd use less than 10% of that.