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I use Docs mostly because it is integrated with all of the other Google products I use regularly, but Zoho is good too. Docs does support more file types which can be important, depending on what you do. For instance, AutoCad files are not supported in Zoho, which could occasionally be an issue for me. Mobile apps for Android are also superior for Docs, which is not surprising since it IS a Google product. Zoho is slightly better at MS Office integration, but not so much that it makes a huge difference.
Really, both Zoho and Docs are pretty decent, and I think they are essentially comparable in use. Other than the couple of areas I mentioned, nothing really stands out to me that makes one better than the other.