installing on mac air development machine

we've always installed on linux so need help with a new mac air running
latest osx

in the instructions it shows several methods:
1) enterprisedb (but this does not look open source ?)
2) fink
3) macports
4) source
etc

what do most use ?  thks

ps:  is there a mac build for 9.4 beta 3 yet ?  we would use that if
available and not too hard to install