We are talking about heavy doubles here, are we not??

Buying any gun that doesn't fit would be as silly as buying underpants that are too tight!

But, assuming we've got past that stage, take them ALL to the range if possible and shoot them.

Then buy the rifle that doesn't kick the beejeezus out of you. If it's comfortable to shoot, you will shoot it well. It's inherent accuracy is of little practical import for instinctive shooting under 50 yards anyway!

My guess is that you will pick the Pommie double, because if nothing else, they did understand how good stock design controlled recoil.