Much of the choice is preference and opinion, to be sure, and different people will have different opinions. I do not want to impune Vortex, as they have some great qualities, and many will choose Vortex and be very happy. Some is personal bias, to be sure, in terms of image clarity and reticle quality. I also recognize that facts and circumstances may change over time. Feel free to throw rocks at me if you disagree. I am putting the sum of my experiences into a generalization, which may or may not be qualitatively accurate, but we all have opinions and biases from direct experience and what we have observed, learned and heard.
I have seen mention of larger numbers of returns on the Vortex. To their credit, both Vortex and PA have great warranty and return service. I see Holosun and PA being more innovative in the design and reticle choices (opinion), and I have seen quality inch-up with each of those brands. Vortex, on the other hand, is hit or miss (opinion). They have no brand identity (opinion) and they have products that range from hobby to best in class. I very much like and support the PST and Razor lines, although, even at those levels, I see more reports of failures than other competing brands within the PRS community (which, is btw, very supportive of those brands). I am not sure why, but again, warranty service is outstanding with Vortex.
We have done some testing for our tactical community on scopes, and also reference the testing of others, for which we refer to as the “throw it down the driveway” testing, which is the standard we use for our mil/LE customers whose lives may (and often do) depend upon their scopes and red dots. None of these brands mentioned meet that criteria, and some we have not actually tested, but did not meet other entry criteria. For those needs, there is a very small subset that we recommend and sell. Most notably Trijicon and Aimpoint in the smaller point and shoot optics. Some others in the RMR and low-powered scopes.
Hope this helps. If not, just take it like a belly-button. One guy’s opinion, and we all have one and not really sure what to do with it.
If someone is happy with Vortex, I would not argue, and I am sure he / she will do well and enjoy his or her optic.