I've never had an issue over the many years of using Dropbox. I've had issues with OneDrive.
My work uses a shared folder on OneDrive and it sometimes fails to synchronize. So if my work partner updates a file, it can happen that I will never see that update. I haven't figured out a way to trigger it to synchronize. I go to the OneDrive website to grab the updated file.
Over the many years of using OneDrive, failure to sync has caused us headaches maybe 5 times. I suspect the sync failure has happened much more often and we lucked out not stepping on each other's work.
My work partner uses Windows and I use Mac. I would say that he has just as many problems with it as I do.