Adguard (paid), has been working great out of the box on my iPhone. Tried others but this one has been the best so far. I don't use their included VPN, so don't have opinions on it.

Greatest advantage is being able to use Custom Filters.

One caveat: my aging iPad sometimes struggles or reload pages, and runs out of memory, not sure if I should attribute it to the adblocker or to the iPad's age, probably should restart it, or get a newer one.

I would also add to the mix:

• StopTheMadness Pro (paid too)

which can do two great things:

1. Show native video controls, and

2. Can skip YouTube ads

(and the developer is quite responsive)

Orion with uBO works well, if you can get over Orion's general bugginess.

AdGuard is system wide and works well for me, but it isn't free