I really have the feeling that DropBox will die. They don't do anything Google Drive, Microsoft OneDrive or Apple iCloud doesn't do, and these companies all have much more money / talent / infrastructure / synergy with other products.
For some reason I still only instinctively trust Dropbox to reliably sync my files. I'm always worried I'm going to lose something if I put it into my Google Drive or iCloud folder, though I'm sure by this point it is probably just as good/reliable.
My concerns have less to do with individual files being manually added to a Google Drive or iCloud folder and more to do with how well it handles starting entire new project folders w/ hundreds (or thousands) of files that are constantly being updated.
> For some reason I still only instinctively trust Dropbox to reliably sync my files.
Used to be that way for me too until all the nasty tricks they employed in the OS X app installation process to elevate their privileges came to light. Though the syncing still works as reliably I no longer trust them with the content or to behave responsibly.
I haven't had any issue syncing with OneDrive or Google Drive for larger projects. I don't doubt you might've run into that issue in the past but I'd recommend giving it a go if that's what's holding you back. If anything knowing that you can reliably switch storage providers in the future should you need to is a good card to hold.
In the case of Google, and to a lesser extent Microsoft, I don't have enough trust they'll keep their offering around to ever start using and relying on it.
Google and to a slightly lesser degree Microsoft have horrible histories of simply turning off successful services. Or "improving" them by replacing with something objectively worse.
