I have a Kowa 821 with a 27X EER eyepiece and it is the cats ***.. unbelievable clarity and resolution. BUT....... Its big and heavy and a pain in the butt to cart around..
So my Go-to spotter for up to 200 yds is an old Bausch & Lomb Balscope Sr with a 30X eyepiece. And if you have never used one, they beat the hell out of the new crap thats on the market today. I've had 4 of them, If I see one for a reasonable price, under $100 I'll pick it up. they are easy to disassemble and clean properly. The only thing you need to watch for is the very early ones do not have the screw camera mount and you need to find a tripod compatible saddle mount to use it.