Q:

The best way to install python 3 on Mac OS X

What is better way to install python3.3 on Mac OS X?

via homebrew
or via official installer in http://python.org/download/

A:

Most people working in the Mac world will recommend homebrew or macports, I think.
I personally prefer homebrew. It doesn't install anything other than what you need, and it allows you an easy uninstall option, too. (brew uninstall blah). It also allows you to keep up with updates more easily.
Plus, (and I'm not sure if this is true with macports), you get pip for free.

That being said, you may have to get your hands dirty in your bash_profile and possibly your /usr directory---if you want to type python at the command line, and get your installed version of Python, you'll probably have to change some symbolic links.
I HATE/am not very good at fooling around with system settings, but I had my complete Python installation up and running in less than an hour, and it has been running without any issues for quite a while.

