The quality of your EoP will depend on the quality of your electrical wiring and whether there are any devices in your house causing interference on the power lines (inductive kickback or whatever it's called).
I have a house of over 400m^2, double volume, and electrical cables have to run a long way. I use four EoP devices in my house, and I get around 45Mbps over it. That's more than enough for streaming 2x UHD.
Obviously having a CAT6 cable is best, just not practical, and is definitely not an option for my house. Wifi is unreliable, as always, depending on where you need the signal to go. It has trouble penetrating a concrete slab with a steel mesh, as well as getting through more than one wall.
For my house, EoP was definitely the best option by far. I bought TP-Link, I hate TP-Link, but don't really have many issues with those and their price is more suited to my pocket. Ideally, if you can afford it, go for the Linksys/Cisco brand.
Also, don't mix brands, even if they are all working on the HomePlug AV specification. I did that between Linksys and TP-Link, and oh boy did that make me grow old.