I think first and foremost you need to accept that nobody here can give you the answer you are looking for i.e. which .22 subsonic ammo is best.
All you can really get from the replies here is that there are a number of acceptably accurate brands out there. To go further than this you need to try them all and see which one your rifle likes and whether or not that round is suitable for the task in hand.
Ive had a number of .22 rifles and no two have shot best with the same ammo. I had a CZ 455 that was stunning with Winchester subs yet Ive not had any other rifle shoot them well since. The stuff made by Lapua under the SK banner is very good, either SK Standard or SK Match, RWS HP, most if not all Eleys shoot well but again your rifle will have a favourite. Ive recently acquired a Sako P94S Finnfire, by far the best of the rounds I have mentioned in this rifle was Eley Sport. I was hoping the SK stuff would be good as I have another rifle that likes them but the Eleys were the best.
I have a CZ452 which really loves SK Standard and again it shoots them much better than any hollow point hunting round but sadly unless taking head shots I dont find it good enough for rabbits as I had a few cleanly chest shot bunnies run into cover which I dont like. Since this is my truck gun I had to settle for RWS HP which although not quite as accurate dumps more energy into a chest shot and stops them in their tracks. When Im collecting fox bait on windy nights I much prefer the ease and speed of a chest shot, it means I miss far less