Having owned, worked on and cut wood with many brands of chainsaws, I prefer Stihls for a number of reasons. I could do what I need to do with any brand of chainsaw but because I have a choice, Stihl is what I choose. That doesn't mean I couldn't walk out to my shop and lay hands on a McCulloch, Homelite, Poulan, Husqvarna, Craftsman, etc, etc.
Our OPE preferences are formed by a combination of experience, recommendations, hearsay, advertising and so forth. If we had a discussion of which pick up truck was best, I'm sure the preferences would be divided into a number of categories and everyone would have a reason for what they think is best. Again, I could do what I need to do with any truck but the ones I put my saws in most frequently say GMC on them.