If you have a completely stock set-up, then a stock PCV would probably suffice. But if the engine has any mods, then an adjustable PCV has some real benefits. Very few things are 'one size fits all'. That is true for PCVs, too.

http://mewagner.com/?p=444

https://www.powerperformancenews.com/tech/an-adjustable-pcv-valve-for-the-street/

Master, again and still