I have a few questions about using Ruby on an OS X 10.11 El Capitan:
I'm considering leaving Apple's built in Ruby alone and installing a separate one, leading me to my second question:
Don't mess w/your system Ruby, your system needs to be stable and it's not necessary.
Homebrew isn't made to manage multiple versions of software. RVM (and others) and made to do exactly that. I currently have 6 rubies installed. I'd hate to have to manage that manually. RVM (or friends) is the way to go if you are installing Ruby on your host. People often go to the next level and use Vagrant instances to further isolate their development environment.
IMHO the most important reason to use a version manager is to be able to run multiple different versions of Ruby on the same machine e.g. to test gems with different versions or to run several (legacy and new) applications on the same development computer. Rbenv or RVM makes this easy, Homebrew doesn't support this...
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