The most expensive Blu-Ray Players I can find was a 4K & 4K upscaling 3D Blu-Ray Player for about about $200 USD. That is about the price of a XBox One S and a good $100 less than a PS4 Slim- The latter of which doesn't play 4K Blu Ray.
Otherwise, the dedicated players don't really play better than game consoles capable of playing the same formats. The biggest difference is going to be in the interface. A remote can often be easier to use and the dedicated players have a content focus where as the more general consoles require you to run "apps" in order to Play Blu-Ray discs (or DVDs, for that matter). and sometimes it doesn't work, for no particularly good reason. I've found Microsoft arbitrarily and sometimes wildly changes their entire interface on the XBox every few months, for example.
I usually don't bother to use my XBox One to play Blu Ray Discs. However, it is perfectly acceptable for it, and I presume both the PS4 and the PS3 even are just as fine for the purpose of "standard" blu rays. It's only with 4K that you have to start shopping around and doing comparisons, I expect. Personally, I opted for another alternative- I got a Blu Ray Drive for my PC. With a capable enough system and with some additional software, it is fairly easy to play Blu Ray discs in VLC Media Player- but even better- I can skip the "unskippable" garbage they always have at the beginning, and directly play the actual content.