I have two SilencerCo Sparrows (original aluminum and the new stainless) and more recently picked up an Energetic Armament Nyx Mod1.
All depends on your priorities. When I bought my Nyx, I wanted something titanium and very light. The Nyx fit that criteria. It was new, but seemed to get good reviews from those who had shot them. I'm loving mine so far. Feels like nearly nothing on the end of a gun, and coupled with the Ruger Lite, it's a heck of a light package.
I went with the Mod1, but they also make a Mod2 which is modular. You can shoot it in long or short configuration. Short configuration is really meant for a rifle though, where you don't need as much volume for good suppression. 99% of my rimfire shooting is with a pistol, so I figured if I had a Mod2, I'd almost always be shooting in long config. Long config is heavier and longer than the Mod1. Between that and the fact that the Mod1 is uber light anyway, I just went Mod1.
If you want something light, the AAC Element 2 is also pretty light and very popular here. It's being discontinued though, supposedly the last batch will be coming out soon.