[zeta0134]

Not necessarily true if both ad blockers are using the same filter lists. I find Adblock Plus and uBlock Origin (I prefer the latter) to be relatively on par in terms of things they block and things they tend to miss, even cross browser. I think the initial pageload would be the biggest differnce, as it relies on the performance of the adblocker in applying its filters to the DOM once it's loaded. The underlying extension framework probably affects this a lot too.

I'd think the user agent string is more likely to cause a huge discrepancy, as many frameworks will be utilizing polyfills and employing different technologies depending on what each browser supports. (Or, in the case of the user agent string, what the framework thinks the browser supports, regardless of how correct its assumptions are.)

[cptskippy]

His point is that only one of the browsers was using an ad blocker so they were rendering different content because one rendered ads and the other did not.

[zeta0134]

Oh, I totally missed the part where Opera has the ad blocker turned on by default. Ignore my rambling then; my sleepy brain thought he was talking about two browsers that both had different ad blockers installed.

[bialpio]

Not sure if Opera has it on by default - all they say is that it is build-in so that somehow makes it okay to use it and compare apples to oranges :)

If I understand both tests correctly, Opera ran with adblock and battery saver enabled (those are apparently not default settings), versus Edge without adblock, on sites which supposedly are ad-heavy - this will bias the results towards browser with adblock enabled.

[cptskippy]

Exactly, it's like saying your bus with no passengers gets better gas mileage than your competitors bus with 60 passengers.