I've found that AdBlockers on Safari don't work well at all. I have 1Blocker on my iPad, and not only does it fail to block YouTube and many other ads, it also seems to slow down Safari and induce crashes + memory leaks.
this has the side-effect of removing all Youtube ads, and you get familiar controls for the video player.
I can't say I've seen any issue with performance or crashes due to 1blocker being active, on phone or Mac (I have on my iPad too but dont use that device any where near as much as the phone/mac)
I kinda wish I could use 1Blocker on my Apple TV :P