Linux ditributions are the packages you can buy in stores, like: There packages give you a easy installation, with or without a helpdesk support, and a lot of additional software to get working with Linux. The additional software can be: The reason why making the correct choice is important: The distribution must contain software you need.
So in our case, we want it to contain HAM software. The only one I know that contains HAM software is SuSE Linux.