While we're on the topic of hardware, let's talk monitors. More specifically, let's talk lots of monitors.
Display die-hards love Windows 8's deeply improved multi-monitor functionality--it's a huge step up over Windows 7's several-screen support. Is it perfect? Nope. But it's pretty darned good, and an absolute cinch to set up.
Macs and Linux boxes have dead-simple multi-monitor software, too, but they can be a hassle to set up on the hardware side. Mac desktops drive video via Mini DisplayPort or Thunderbolt connectors. Both technologies are utterly awesome, don't get me wrong--but neither is anywhere near as ubiquitous as HDMI, DVI, or VGA. Linux multiple-monitor support works great, except for when it doesn't. Finding working monitor drivers can occasionally...