Mac laptop isn't any faster than a PC laptop. It has the same guts, however, current gen Mac laptops are actually slower due to lack of hardware updates (rectified later this week).
The build quality is really the same. The battery life on a MacBook Pro is laughable and probably not a good idea to boast about. We've replaced numerous batteries on our 2-4 year MBPs over the years. The things just don't last, even with proper cycling. MBP batteries are fail. It's even funnier that you compare a MBP battery to a cheap PC laptop's battery. Typically the cheaper PC laptops have smaller screens, consume less power, thus burn through battery power even less. FAIL example.
As for "stabler", whatever that is, running After Effects, Maya and the rest on a PC is a lot "more stable" than on OSX. Linux even more so. If gramps is buying a laptop, web surfing, excel spreadsheets and word are stable on any platform and a cheaper PC laptop would be a better buy, period.
I said those are debatable. OP was looking for more or less lousy excuses to convince his dad to buy him a Mac. This topic has been discussed to death too many times. The answer is MBPs are not better than PC laptops. Both use the same hardware and have their pros and cons.