I use Dolphin in the office, and Nautilus at home. I feel managing files in Dolphin is a little more efficient than in Nautilus, but only a marginal better.
Today I find Dolphin does not support files drag and drop into browser for browser to upload. Drag and drop is an exciting feature of HTML5 and Google has implemented it to Chrome. I quite enjoy using it uploading files to Google Documents.
I would like to use this feature as much as possible but at moment I have to use Nautilus to drag and drop to Chrome. I believe soon I can also use Dolphin to drag and drop to Firefox.