I am a minority. All of my transactions are 100% here. I am using Nook Exchange to keep track of my items that players can catalog. I am not sure if the other sites offer better alternatives.
I use the ACNH.Guide app for cataloging, but I also use the Villager DB website as an easier way to track what's missing - especially DIYs and clothing. They're really helpful as a pair of tools!
I've tried Nookazon a few times, but it was sort of stressful. Users would list an item with a requested price, I offered exactly what they wanted, then they declined my offer and relisted with a higher price. It's more time and stress than I want to invest for one single (usually overpriced) item
I use VillagerDB the most frequently. I also use Nookazon very rarely, but can't really compare the two since I only trade on Nookazon, and use VillagerDB for my list-related needs.
Nookazon is kind of clunky in some ways, and trading there can feel sketchy at times, since there's a lot of people with 0 reviews, or very few. I greatly prefer to trade on here, but with Nook's Cranny getting a lot less traffic lately, if I want to get rid of something quick, I usually resort to Nookazon.