I use both for hunting .22 daytime .177 at night but using a Daystate heavy pellet 10 .3gr , found lighter pellet is affected by the wind and the heavies have a lot more knock down .
If I had to chose one it would be .22.
some may say .20 but with lighter pellets In .22 and heavy pellets in.177 , IMO the .20 are a waste of time for that reason.
Hope that makes sense now fry