Hi Grant,

Briefly there are two ways to do ad-blocking in Safari: event-based and 
list-based.  The event-based method is exclusive to OS X and has been around 
for quite a bit; the list-based method is new to iOS 9 and OS X El Capitan.  
The market on the Mac has been served by event-based ad blockers for a while 
now, and thus the list-based extensions (which are fewer and more limited) are 
not as popular or well-known.  On iOS, of course, where ad blocking is now 
possible, it’s a different story altogether.  Event-based blockers are script, 
as any other extension is.  On iOS, the list-based blockers maintain the lists 
for use by Safari; there is therefore no way for ad-blocking, by itself, while 
you are in Safari, to communicate with the network.  On mac the lack of 
compartmentalisation means that anything is possible, regardless of whether 
Safari uses the same mechanism.  Still, unless you are careless, I doubt you 
have anything to fear from any ad-blocking on that platform.

My preference is the old-style AdBlock (not AdBlock Plus, although nowadays the 
differences are few).  There are others out there, but I appreciate the 
maintenance profile of AdBlock; it’s mostly set and forget.  My network is also 
doing ad-blocking at the DNS level, so many iOS apps suddenly can’t get their 
ads anymore (sorry guys, but it is the path you have chosen).  Doubtless many 
other iOS users will be feeling the same joy when they discover that webviews 
now get Safari’s ad-blocking; webviews are how many apps display their ads.  
Oh, and it helps that Apple is disbanding iAd.

Cheers,
Sabahattin

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