depends a little on size of yotes in your region, too. a whopper for me is pushing #25 lbs. Most northern and eastern specimans sound like they are much bigger than ours.
I use #2 longsprings almost exclusively on them, and get nice catches on all of them. The design of the double longspring I think helps in higher locking and less ability to open the jaws up at all, a deficiency in 1-1/2 coil designs. But, jaw spread is identical in 1-1/2 coils and #2 longs, except for the newer sleepy creeks which are slightly taller in the closed jaw height.
I get away with the #2s because of the smaller coyotes and this helps me with the other critters like cats and foxes and somewhat on coons. I've held a few coyotes in #11s meant for coons, too. Double jaws are stiffer than regular jaws, so was able to hold them without popping the jaws. These were all toe catches though...just not enough jaw height there. the #11 is a decent fox trap though, and I have a pic of a cat in one also, caught across 3 toes. Longspring design helps too.
Jim-NE