Bung: Extreme opinions either way about similar products seem suspicious. There's probably a reason that's got nothing to do with paint.
Could be price.
I know diddly about paint, but a friend of mine works in the industry (including previously for Resene) and says Resenes paint is overpriced crap. YMMV.
On the occasions we have hired painters none would use Resene. One painter said he would use it, we had bought some already, but he wouldn't offer his usual warranty on it.
Dulux was the paint they suggested.
I wonder if part of/the main reason painters recommend a specific brand is because of their own relationship with the supplier? Do suppliers offer sweetener deals, eg discounted or free equipment? That there are clearly so many divergent opinions from ‘professionals’ towards these two brands indicates it’s not solely about the quality!
Painters get the best price on the paint they use the most of, and probably some form of reward scheme I guess. I have had professionals say "we use Dulux or Resene, your choice, both are fine".
There were a couple of comments above about not requiring pigmented sealer.
You should use pigmented sealer over wallpaper to:
1. prevent the likely water based glue from activating and causing stains on your paint, or worse, causing the wallpaper to bubble or pull away
2. prevent anything under the wall paper seeping through into the paint
3. preventing very cheap paper based wall paper dyes coming through into your paint
Even if you do a test patch with a water based primer and it comes up fine it will be somewhere like a part of a seam or where the wallpaper is damaged that will cause the issue.
Source - sold paint a long time ago, and was fed the coolaid by both wattyl and dulux. in this case, they both recommended exactly the same.
Wallpaper can bubble over time, so stripping can be worthwhile.
Here at the Casa de Cowboy they seem to have slopped chalky white primer over the wallpaper followed by a single top coat of coloured paint, given that white spots appear on the bathroom walls when they get damp. So if previous owners have painted over wallpaper consider stripping it before the re-do.
Resene official guidance regarding pigmented sealers and painting wallpaper: https://www.resene.co.nz/blog/painting-over-wallpaper/
Ive made the mistake of using cheap paint (outdoor surfaces)
It didnt last . It made alot more work for me to completely sand/strip it off .
The Dulux exterior paint I used lasted 20years , apart from a few patches here & there .
Ive also had good luck with Zinwell paint .
If you are going to paint , spend the $ and get a well known brand with a good reputation.
You dont want t have to repaint too early.
No mention of British Paints? Not recommending them, but now just wondering if there was a reason no-one is using them?
I'm literally just about to start painting a room before the carpet goes down and ended up with a bunch of BP through the highly scientific process of picking the first one of the shelf at Bunning that didn't look cheap and comparing the things it says on the tin to the other big brands mentioned here. Luckily I'm only going to be slopping a color over an existing layer though.
I suspect my sub-par skills as a painter (and plasterer/builder etc) will be more limiting than the paint tbh. Until I see some evidence to the contrary, my suspicion is that, like more than a few consumer products, once you get to a certain level of spend they perform roughly the same and the other end of the brush matters more.
In saying that, I did like the look of Dulux's specialty paints at Bunnings, but I don't think the SO will be happy with painting the lounge 'Theatre Black'...
My understanding is British Paints is made by Dulux. If you go to the British Paints website the contact me link goes to Dulux.