This has been my experience. I bought some Devolo powerline adapters a few years ago to try in my apartment, and got quite poor speed (<100Mbps) and network was rather unstable. Switched to WiFi and got better speed and stability.
Last year I moved to a new place and faced the same issue of wanting internet in a different room and tried the Devolos again. Same experience except worse speed. Again I had to fall back to WiFi, which at least gets me ~150Mbps here.
Last year I moved to a new place and faced the same issue of wanting internet in a different room and tried the Devolos again. Same experience except worse speed. Again I had to fall back to WiFi, which at least gets me ~150Mbps here.