in my experience the males only scent mark a little bit of what seems to be very dilute urine, it does not smell as strong nor is it as sticky as reg urine
I've actually had girls who peed on me more lol
I've had mostly neutered males but the two intact ones I had didn't seem to mark any more than the others
they did, however, get icky buck grease when they were older and were more prone to penis plugs
if you get the boys neutered, which is a good thing to do anyway, you would probably want to go with boys
you can have big and cuddly girls but not usually til they are older and even then, they are gonna want to run a lot first
I've only had very old girls sit still for long cuddles, but I imagine every girl is different
on the whole though, girls are just a lot more active