Dropbox mostly, because they were first, because it "just works" (especially the very nice "it's just a folder" client on the Mac), and because there are a *lot* of iOS apps with built-in support - you can't throw a rock without hitting a text editor app that supports Markdown and Dropbox (Byword is the best, BTW). Also, my Dropbox account is 13GB and completely free, as a result of jumping through various hoops (won an early contest, participated in others). If they had a 50GB/$50 tier, I might pay them, but not going for the 100GB/$100 tier.
A number of things sync to/through iCloud, and I'm happy to let them, but I don't think of it so much as a place to store files (particularly since it intentionally doesn't allow much cross-app file access). On the other hand, I'm very happy to use iCloud for my iPhone/iPad backups, and some email (to get the push notifications).
I have a Box account mostly because they said "want a free 50GB account?" at some point, but haven't used it much (mostly because of the lack of built-in app support).
And I *just* signed up for a Microsoft OneDrive account because it's 7GB of free space to use with the free all-platform OneNote app (testing it out, don't know if I'll use it much).
Basically my Dropbox account is free and works, so someone's going to have to come along with a *much* better mousetrap (uh, more supported and even more free?) to get me to switch.
A number of things sync to/through iCloud, and I'm happy to let them, but I don't think of it so much as a place to store files (particularly since it intentionally doesn't allow much cross-app file access). On the other hand, I'm very happy to use iCloud for my iPhone/iPad backups, and some email (to get the push notifications).
I have a Box account mostly because they said "want a free 50GB account?" at some point, but haven't used it much (mostly because of the lack of built-in app support).
And I *just* signed up for a Microsoft OneDrive account because it's 7GB of free space to use with the free all-platform OneNote app (testing it out, don't know if I'll use it much).
Basically my Dropbox account is free and works, so someone's going to have to come along with a *much* better mousetrap (uh, more supported and even more free?) to get me to switch.