True they don't run linux, they run Apple's own version of BSD which is similar.
They are very overrated, working for a reseller that sells both you get just as many problem with macs as pc's, mac users just rate theirs higher. They have plenty of their own issues and hardware breaks down as much if not more than a teir 1 pc vendor.
There really isn;t any advantage anymore to running Mac's other than being part of the 'in' crowd. You can put one of the easier linux distros on a pc and have the same thing, linux has grown up to where it just works now.