unxutils has old versions of a bunch of some of the most useful utilities. including grep for example.
gnuwin32 has later(more up to date) versions, of a much larger number of utilities. That's obviously a major advantage.
Bear in mind that gnuwin32 has that major advantage.
With unxutils, you can run into issues as it uses old versions, and when looking for help people will expect you to have the latest version of this or that command.
There are some smaller advantages that unxutils has, that makes unxutils very useful.
- unxutils has xxd, gnuwin32 does not. (Note, VIM 7 also has xxd)
- gnuwin32 as of writing(2014) has a broken tail -f, unxutils's tail -f is older but works. (mentioned here )
- the following is a smaller advantage, but if you're very lazy, or just want to use it quickly, then unxutils is just a zip you can extract the executables and go. Gnuwin32 involves a wizard to install various bits, and even some individual utilities have to be installed separately like a setup executable for wget, one for grep e.g. (grep-xxxx-bin.exe). with unxutils you just extract from their wbin directory within the zip. Bear in mind though they are older versions so if possible, if not being too lazy, one would generally see if gnuwin32 has it.
- unxutils can work standalone where lots of the equivalent gnuwin32 binaries cannot. So if you don't want to or can't install gnuwin32 then you can use a command standalone, from unxutils. For example, gnuwin32's tr.exe requires two dll files in its directory or it says they're not there and won't run. gnuwin32's sed doesn't work standalone, whereas unxutils tr.exe and sed.exe work fine standalone.
The unxutils sourceforge link has unxutils.zip and unxupdates.zip (the latter being a subset of unxutils.zip but with later versions). The sourceforge link's unxutils.zip is down but is available https://archive.org/details/UnxUtils
Generally look to Gnuwin32, but know that unxutils has some advantages.. Gnuwin32 has almost all the commands that unxutils has, plus a lot more.