protocelt said:
Is Coke or Pepsi better, and why?
That's exactly the correct way to look at it.
Comparing FreeBSD and Linux (and MacOS and OpenBSD and Windows and HP-UX and various embedded OSes and AIX and Solaris and...) is more like asking: Is pizza or beer better? How about Boeuf Stroganoff, grass (if you are a cow), Cabernet, or linguini alfredo?
I happen to run FreeBSD on my home server, for (what I hope are) good reasons. It used to run OpenBSD and moved, for some specific reasons that should not reflect badly on OpenBSD in general, but only mean that there was a slight incompatibility between OpenBSD and my intended use. I'm typing this text on a Mac laptop. I could also type it on a Windows laptop, or a few iOS and Chrome devices that are floating around the house. In the office, there are lots of Linux machines I use and like, plus lots of Mac and Windows desktops I have access to, and even some more unusual commercial operating systems on servers. They each have their place.
In such a comparison, questions like kernel performance, loadable modules, GNU licenses, and having older source code are input facts, which can turn out to be positive or negative, depending on the desired use case. For example, I happen to think that having many open source developers working on a project is a BAD thing, and that important pieces of code should be worked on by a small number of highly competent people, who are averse to changing things if they don't need to be changed. Other people might come to the opposite conclusion, because they correctly think that a large number of open source developers means that you always get the shiniest and newest toys.
The two operating systems I most ENJOY using are OpenBSD and MacOS. That's because they seem to be the most carefully crafted, with attention to detail. This doesn't mean that they are always the most appropriate for a particular use, but they tend to be the ones that annoy me the least, and where I can best understand the philosophy and design (even if I sometimes disagree with it).