I use only open source software when possible. I dont see the advantages of using something expensive when theres something you can download for free that will do everything the expensive software will do plus some. I only use Blender for my 3D animations and CADs, and I use Gimp instead of photoshop. These things are free and work fantastic.
Ive been rebuilding scrap computers for a few years now. Once I piece one together I always format the drive and install Ubuntu. Ubuntu is a free, open source version of Linux that can run on old systems and offers everything the average user needs…. email, web browsing, light games and office apps.
You can even try Ubuntu without actually installing it if you have a DVD drive! Give it a try!