I'm thinking of buying my dad a watch for his birthday and after doing some minor research online, have narrowed the search down to an AP Royal Oak and a PP Calatrava. I'm somewhat stuck in a predicament, as I can't seem to choose between the two (I know next to nothing about watches but have heard that PP and AP make quality products). Any advice/suggestions regarding which would be more suitable for a 55-year old Asian male would be greatly appreciated.
Hi there - Option 2 is the most basic, classic Calatrava in the line-up of models currently in production. From your picture I think it's the 5119J. It's a manual wind, so take that into consideration when thinking about your dad's preferences (so kind of you to do this, by the way).
The 5119 was my first Patek and it gave me great pleasure. However, I very quickly ramped up my preferences for complications, so through no fault of the 5119 I ended up trading it out easily for more complicated models. It is a very dressy watch but I had no problem wearing it with more informal get-ups; but, it depends on the kind of lifestyle your dad leads as to which one would suit him better.
I'm assuming your dad has no biases against yellow gold, given these two options. Personally I'd go for the AP - the chrono offers a complication that appeals to me aesthetically, and can be worn in more formal as well as informal events. Depending on where you live in Asia, and whether it gets extremely hot and humid, the bracelet will also come in handy versus the leather strap.
Hope this helps and let us know how you decide!