neither is better. it's a matter of preference. a mac can get a virus and can slow down from spyware and other crap just like a pc (the weak link here is the user not the system). a pc can do graphics and videos just as well as a mac. they both do the same thing they just do it slightly differently so it's really which do you feel more comfortable with.
if i were shopping for a new computer now i'd be looking at a smaller windows laptop. small and light is key. for home i would have a monitor, docking station, keyboard and mouse. windows because it's cheaper for general usage (many good options sub-$1,000 that surf the web and do normal computer functions just fine). if i actually needed the extra processing power that would put price closer to that of a mac then it'd be more of a tough choice but me and 90% of most computer users will be perfectly fine with any of the $600ish laptops out now.
