Mac vs Pc
I'm not a Mac user, but in this case probably Mac should be a consideration.
My impression (friends) is a lot less trouble with viruses, spyware, etc than Whambows
I, myself, run Linux. Just "converted" from Unbuntu to the latest version of "Mint."
Frankly, for most causual browsing, simple printing/ office and photo software, Linux might get you going. IF you want to spend the time to set it up