My ADC snares for Raccoon Fox and groundhogs will be a 27 to 30 inch snare, I like 1/16 to 5/64th 1x19 for the snare, but 7x7 is fine. center swivel and extension 24" for stake to 30 inches for a trail set for anchoring to a post or tree or put a earth anchor on it. longer extension if I am doing depredation work where I do not have people or pets around. I use washer style locks with lop end in yards and areas where a non target may get caught. in my state I can not set a killer snare so I need to have deer stops on all our snares. Animals are alive unless I use a kill pole. I never use kill pole in yards (75 % of my snare sets)
For coyote I use 42 inch snare 5/64 or 3/32 1x19 or 3/32 7x7 center swivel, with 30 earth anchors to 72 inch extensions 1/8th 7x7 again if I am in a yard setting I will use a big lock washer style. the reason for lock washers styles is more surface area around the lock, not digging in to the skin when pressure is applied. the lock setting into the cable (kink of cable at lock) will keep the lock from coming back but still will have alittle give. unless a kill stick is there. (entanglement does not mean a kill.)
I need to have all animals alive in my ADC work around yards or jobs where people can see. predator control depredation and fur trapping is a different game for me, unless there are dogs running around then I go to my populated methods.
This is my thinking not every one will agree, we all need to look at what and where we are snaring, what is the goals and what are the draw backs. lethal vs non lethal. all locks will kill if set up for it and most all locks will not kill if set up for it. spring assist, power locks and such.
Here is a grey in a tangle using a big washer lock

this red is in a non tangle washer lock

here is a slim lock set up I use