The Cats underlined their AFL premiership credentials in a 15.17 (107) to 12.8 (80) triumph on Saturday evening, their fourth consecutive win, in front of 35,869 fans at GMHBA Stadium.
"I'm not sure which one's better, but I know they're both in the conversation to be the best team in the comp at the moment," coach Chris Scott said of Brisbane and Sydney.
"It's pleasing to get the outcome, but I don't think any of the teams at the moment are sort of coming away - or the teams at the top anyway - are coming away thinking that they wouldn't be a chance.
"So it's nice to get the result, but I don't think there's any reason for us to be overconfident.''
Geelong (32 points) move to third behind Fremantle (40) and Sydney (36) ahead of facing Carlton at the MCG next Friday.
Sydney's James Jordon kept Bailey Smith to eight first-half disposals, but with Geelong controlling the midfield, the Swans dropped the tag at halftime.
Smith had 18 touches and a goal in the third quarter and finished with 32 possessions.
Asked if he was happy with how that call played out, Swans coach Dean Cox conceded he wasn't.
"To have a different look when a side's gaining ascendancy, that's the things you try and discuss - 'all right, do we drop this to try and spin more numbers through the middle of the ground?' And it didn't work,'' Cox said.Â
"I'll be the first to put my hand up with that.
"He had 18 (disposals) in the third quarter. That's a collective as well, I think that's part of the way our defence and our mids were beaten tonight."
Sydney's Malcolm Rosas (left ankle) limped off in the second quarter and Tom Papley (calf tightness) sat out the final term, with Cox awaiting updates.
Scott hailed Lawson Humphries (33 disposals and 818 metres gained) as "outstanding".
Max Holmes (35 disposals, 712 metres gained), Jeremy Cameron (three goals, 21 disposals) and Gryan Miers (24 disposals) were influential.
Connor O'Sullivan blanketed Charlie Curnow (two goals), Oisin Mullin managed Isaac Heeney, and Mitch Edwards challenged ruckman Brodie Grundy.
Sydney's Joel Amartey kicked four goals, while James Rowbottom limited Tom Stewart's influence.
Sydney led by 10 points in the second term but couldn't handle Geelong's frenetic pressure and ball movement as the Cats nailed five unanswered goals.
The Cats led by 38 midway through the third quarter.
Sydney responded and Logan McDonald's two late goals cut the deficit to 14 at three-quarter time.
Cameron and Patrick Dangerfield - limited to 57 per cent game time as Geelong manage his minutes - kicked terrific goals from the boundary to seal victory.
Tanner Bruhn was managed, with Jake Kolodjashnij a late inclusion.
Sydney next host Richmond on Saturday.
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