Rtings seems a similar project; some of their test results are free, some are paid. They have a wide set of comparison tools, they test for a lot of features and they document their testing procedures well; it's a really nice change from SEO spam articles.
I recommend their tests of headphones [1], I especially like how they measure breatability [2]. They also have a page about printers [3].
Finding review of tech gadgets and hardware is quite easy. Even niche products usually have dedicated communities and sites with in-depth knowledge. It's the boring everyday products and large appliances like washing machines that are really hard to evaluate sicne their reviews basically amount to affiliate spam.
Ended up with the OnePlus 8T due to good battery life, fast charging and reasonable size.
Still very happy with that purchase, which wouldn't have been as easy without that site.