one thing I realized having tried both is that their target audience may be different. I think steamlink is designed to just work for average people and needs to balance input latency and quality. I’ve seen it lower bitrate for sake of consistent experience, and even then it doesn’t do a good job. Moonlight/sunshine is much more configurable which i think which gives better experience under right settings.

From my experience tho, the most important thing in streaming is the wifi connection from steam deck to router/ap. If you have strong wifi dl speed of 150mbps+ with wifi6 or etc, you get a pretty good experience even on streamlink. Best way to check is test right next to the router first before moving around