Powerline adaptors are the spawn of the devil and should be incinerated and buried.
You can't beat a proper Cat5e (or better) cable connection. Bandwidth is going to be more reliable, too.
I guess you have had a bad experience. Mine with powerline technology is very good. I could not get a wireless signal to penetrate our concrete floors and was reluctant to embark on a major wiring job to install Ethernet cables through three floors.
Four plug-ins at a cost of around 100 quid and I have totally reliable connectivity. Yes the theoretical 500Mbps is wildly optimistic over any real distance, but it is still way more consistent than WiFi.