It might be, hard to say for certain - however in my experience, it's not generally any worse, maybe some slightly higher ping times. I have never had any issues with it in games/voice chat. They used to get a bad rap years ago when it was new but these days it's generally a good option.
I am also in a new build and i'm just a bit up and over from where the wifi hub lives under the stairs. I'm on BT FTTP and have the Smart Hub 2 - the connection is very good over WiFi, but my PC doesn't have a WiFi adapter. In the past, trying USB adapters has given truly terrible performance (I've never tried PCI-e, though) so I went to powerline and it solved my issue. I've actually been using a spare WiFi mesh system since moving to go PC > Cable to mesh base > wireless beam > main mesh base > router - the reason being that my powerline adapters are only 100mbps as that's all I needed at the time. This works surprisingly well too.
When I have looked at which wifi adapter to get that would actually deliver acceptable performance, they are generally coming in pretty pricey. I have a WiFi6 access point, so I was tempted to try a pci-e wifi6 card, but not got round to that yet.
Having said that I just did some tests with my adapters and pings are generally between 15-22ms; a little higher than my Mac on WiFi which is usually 14-16ms. Speed wise it's topping out at the full 100mbps.
I actually plan to get some better (gigabit) adapters for long term, but not sure if that would result in a ping drop but also I am not too bothered if it doesn't.
One thing I would say, if you do go powerline, you tend to need to dedicate a wall socket for them - you can't use them on an extension - many units however have power passthrough, so there is a plug socket on the front of the adapter, so you don't lose the use of the socket for other things.