.20 is nice but if your not hunting anything bigger than a rabbit I would stick with. 177 as there is a greater variety of pellets to choose from
The.20 I use in my Evolution are 11.? Grain. You can get .177 of similar weight
Gun wise I love my RAW
I regularly shoot alongside experienced shooters using Brockock, Daystate, Weirauch, Air Arms and Steyr PCPs and my RAW will equal any of them for accuracy