won't let you customize the file name (default is eye-mm-dd at hh.mm) won't grab the title of the window you snap (unlike Monosnap when I have to take many shots in a row, I keep going back to Monosnap so files in my designated Screenshot folder are not just an endless list of files named by date and time, but categorized by window/app snapped) records time-limited GIF movies for quick demos won't shrink quality/resolution of snaps on Retina systems (an option under Preferences)
allows you to keep multiple screenshot windows open (love it) provides the necessary (basic) options for sharing your snaps (Dropbox, email, Twitter, Facebook, and Message I mostly save to Dropbox or share via Message and email) has all the tools you need to mark up a screenshot if required (incl. Annotate is so much easier on the eyes and it provides everything I need in my workflow. I've been using Annotate and Monosnap side by side for about two weeks now.