Im saying i feel no need for more field of view with the 30xwa eyepieces on the twin 664s.to me the field of view seems much wider than my 12x50 els for comparison. And never to i feel over magnified at 30x. I think the 20x would leave you wanting more magnification at times
I like my havalon piranha for hide work. Replace blades as needed, keep it razor sharp.
My buck 110 is better for leg joints and loin removal. A steel or cheap field sharpener touches it up in the field.
I carry both.