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As someone who runs a mini homelab in a building I don't have access to the Internet hardware, you'd be surprised how a combination of the two can be very reliable and fairly fast.
All my devices have a gigabit connection to one another but the web router is just a 5gHz link.
I can't believe this is so far down. I do SMB tech support. I have clients where I have installed cable, wifi and power lane. In one case cable, wifi, and wifi,/cable powerline.
Which is best? Depends on your use case. Is cable, 2m away from the router best? Well, if you use a laptop that moves from the desk several times a day, it becomes a pain.
Working IT for many different companies mainly in the MSP and SMB markets, yes. There's reason to have different kinds of connections. Powerline is fine if you're on the same circuit, but Powerline can't really jump a split phase in North America where I am, so if you happen to have them on different circuits which happen to be on different sides of the split phase, you're going to have a bad time.
It becomes either a guessing game, or you need to have a journeyman level of knowledge of electrical to figure out if it will work. MoCA is a better option if you can, and of course, ethernet is king.
Anyone doing wiring for ethernet in 2023, I say to you this: for the love of God, don't use Cat5e. Cat6 is the minimum, and Cat6A should be standard. Cat6 supports 10G up to 55m, which should be enough distance for any home applications with few exceptions, and 10G should be enough for the foreseeable future of home networking, since we're barely touching 2.5G/5Gbps ethernet in homes now.
There's a lot of good tech to solve any communication needs, so as someone who has spent far too long troubleshooting wifi, please run a wire wherever it is practical. Save yourself the headache.