I just realized you can search tags and commit histories with fzf in vim.. (:Tags and :Commits) Very cool.
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I use both all the time, and they’re not all that similar.
The GIF in the README explains everything. Also FZF does not use ag at all, you can merely pipe arbitrary commands into fzf.
I havent taken the time to learn ag yet, though I am planning to. But in it’s defense it was very easy to set up and works like a charm. (The only annoyance being when you want to search for a hidden folder/file)
A search tool, similar to ack: http://geoff.greer.fm/ag/