Soldato
As well as Steam Link and AMD Link there's also Parsec and Rainway. Both these options I found were very close to Moonlight performance even on AMD GPUs (based on my old HD7950 compared to my 1080Ti/3070).
I went with Parsec because it allowed me to select resolutions above 1080p and force h.265 codec which boosted quality a fair bit. Last time I tried Rainway I was locked to 1080p, and Steam Link had some weird performance/quality issues every now and then.
Thanks - I might give those a try as well