IMHO The only reason Dropbox is successful because the alternatives e.g. SkyDrive, Google Drive are so much worse.
The biggest gripe I've had with anything Drive-related, has been Google's 'Keep' losing some data from notes I made on my phone while I had a tab open with Keep on my laptop. Apparently my phone didn't get a chance to sync properly before I touched my computer again, so it just totally discarded everything I did on my phone. That was annoying, but it's not really something I associate with Drive specifically, since it still seems like an experimental side project they could potentially kill off at any point.
Dropbox then continued to index all my files and verify that my Dropbox folder was properly synchronized with the server side of things.
Google Drive, however, told me to delete my Google Drive folder and download all my files again.
Since I had a lot of files in there I proceeded by deleting Google Drive and canceling my paid storage instead.
I see no reason why you wouldn't go with Dropbox. Even just for the fact that you shouldn't rely on anything from Google that doesn't have or is related to advertising.
Either way, I use Docs way too much, to the point where I always have a tab with it open, and Drive really ties everything in quite smoothly for me. I also like the Drive app a bit more than the Dropbox app on my android phone, so not really a strong incentive for me to switch back. I actually never made much of a conscious decision to switch to Drive in the first place, it just kind of happened automatically due to convenience, and now I use it almost exclusively.
The only thing that does bug me is the data-loss. I haven't had it happen in Drive proper, but it happening in the short time I've used Keep certainly lends credibility to it being a wider-spread problem. We'll see...
[1] Not that I feel ChromeOS is 'safe' from the killswitch, but it's still a bit too early to tell what their plan is for that exactly
>IMHO The only reason Dropbox is successful because the alternatives e.g. SkyDrive, Google Drive are so much worse.
Thank you for partially restating what I wrote in my comment.