I think there was a rimfire suppressor thread a week or two ago if you want to look.
What are you planning to use it on? If you are using it on a .22 LR rifle, there isn't a whole lot of difference between the more popular ones. It's when you put it on a .22 LR pistol that you will hear more difference, especially on the first round (FRP - First Round Pop). There are some that are rated for 22 mag, 5.7, and 17 HMR and others that are not. Look at the FRP when you are comparing them.
I have a SilencerCo Spectre II and I love shooting with it. It's very good on the .22 LR pistol and awesome on the bolt action .22 LR rifle. The rifle is quieter than a pellet gun.
It is far more important to be able to hit the target than it is to haggle over who makes a weapon or who pulls a trigger.
— Dwight D. Eisenhower