Ditto.
It would be .177 for me as well.
However, I have lots to choose from.
.25 x1 Springer and x1 PCP
.22 x2 Springer and x1 PCP
.177 x2 Springers and x4 PCP's
No need for me to have .20 at all...or any more guns for that matter ...I'm packing... lol.