Hey Marsarya, what exactly are you trying to sync? contacts? music?... etc? I just need start by saying that the iPhone is definitely better for use with Mac OSX, because the sync features are all native and built-in. I sync my Samsung Galaxy with a Mac under the Windows 7 operating system (it works much better).
Samsung have not released any software for the Mac yet, and as far as I am aware the built-in Apple iSync feature does not support the handset.
There are a few different ways to sync media. I found that the best method was to mount the phone, create folders for 'Music', 'Movies', 'TV_Shows', then drag-and-drop the media files into the relevant folders (this is a benefit of the Samsung Galaxy over the iPhone because it can be used this way with multiple computers).
You can access all the media from the phone using the 'music player' and 'video player'.
There is another option for the music (if you want to integrate the phone with an iTunes library).
http://download.songbirdnest.com/installer/macosx/i686/Songbird_1.8.0-1800_macosx-i686.dmg
There is a third-party application that you can install called 'SongBird'. It should recognise your handset and sync the iTunes music.
Your contacts can be associated with a gmail/GOOGLE account (a 'free' option).
The first step is to export your contacts as a vCard, and import this file to your gmail/GOOGLE account.
Then from the handset you can enter the gmail account, and your sync will be active. I have not looked into automating the sync between the Apple address book and GOOGLE but I am sure there are other third-party applications that will do this, or try searching for 'GOOGLE contact management Mac OSX'.
There is another option that I found for syncing contacts, calendars, tasks, and emails but it is not free. The software is about $40 US and connects to Address Book, iCal, and Microsoft Outlook/Entourage. There might be cheaper packages available, but you may not find any 'freeware' solutions that suit your needs.
http://www.markspace.com/products/android/missing-sync-android.html
Let me know if you need further instructions or specific steps regarding anything in this post.