Well, neither Amazon nor Wayfair make their own furniture. They’re both just marketplaces for other companies. A few Chinese factories make all the furniture and then the exact same thing will get sold under a dozen different random brand names. Tweak it slightly and there’ll be two dozen more.
So yeah, it’s very likely the exact same thing at both places, just with slightly different merchants, shipping prices, return and service policies, etc. I’ve had good experiences with both and not really any bad experiences yet.
But really, you’re getting the same cheap crap of low to moderate quality, usually made of composite wood, no matter which specific merchant you buy from. The higher quality ones aren’t going to be racing to the bottom on Amazon and Wayfair.
That said, it’s still usually cheaper to buy the low quality stuff several times over than to invest in really high quality stuff… the difference is like 4x to 5x sometimes.
Wayfair and Amazon are where you go for the cheap shit, IKEA quality or just a tad beyond that. If you want something really durable, shop the other options mentioned in this thread. Feel the wood and check out the materials.