Create a "which tool should I use when?" page

[petdance]

There are many pros and cons to the various tools. Put together a page that lists the various pros and cons of each. Things to include might be:

• ack is fast, and ag is faster, and rg is fastest
• rg doesn't have PCRE
• ag and rg don't allow making your own filetypes
• ag uses memory maps which can be slower on virtualized machines
• rg doesn't have deterministic ordering of output because of its threading.

[petdance]

grep is everywhere. ack is a single downloadable text file in a pinch when you can't install packages.

[n1vux]

(and rg opportunistically / heuristically uses MMAP when advantageous )

[petdance]

Also include licensing information.