Both work good. I have a big cd (around 115lbs) that catches both. Almosthad a 150lb hog killed by catchin on his neck. When he has ear he tends to squat but stay standing. When he catches neck he anchors, he drops his chest flat on the ground amd spreads his two front legs out to the side and pens the hog to the ground. So on him id almost perfer neck.
Man i have one around the same lb as well. He does exactly the same. When he catches both his front legs are tucked in under his body and he just drops everything hes got. I let him go on a 150lb sow the other day and within minutes he broke her neck and killed her. But i cant complain at all