Upload & Sell: Off
Mac os is fine and probably a little more user friendly than windows 7 (which is actually very fast and the most maclike windows I have used), and it's agreed there are more exploits and malware risks with pcs, but ive never had any critical problem with malware or viruses. the few I have gotten were because I opened a link through email etc that I should have known to avoid from common sense. Even then, i was always able to remove the offending agent myself.
Mac vs pc actual performance...you just get more for your dollar with pc, prebuilt or custom built. I must be lucky because the only hardware issues I ever had with prebuilts like dell were with old laptops developing flaky wifi. I've gotten 3 Dell laptops and 1 Dell tower. Then I built my last 2 pc towers both for about $1200 each. So far so good with them, again guess I must be lucky. My last Mac died from a failed mobo, but I bought it dirt cheap (never bought new macs again after first two) so not a big surprise. That was back in the g4 days.
The consideration of editing software cost is the one thing that can narrow the price gap for switching from Mac to pc.
But you still didn't say why you are going for a laptop instead of desktop.