Opera 27 Adblock Plus versus Adguard
I've tried both and each seems to do the job quite well.
Does anyone else have any opinions in terms of efficiency and resources?
uBlock seems to be getting a LOT of good word-of-mouth these days, notably for efficiency and resources. Their wiki makes for interesting reading.
I use Adblock Plus.
All of them are great ad-blockers, but I prefer AdGuard, because it has the best phishing protection I've ever seen in a product of it's category. Also, it consumes less RAM than the best-known extensions like AdBlock Plus and AdBlock. But I must say: if the phishing protection isn't that necessary for you, uBlock is the best choice.