This is like asking which child is your favorite because I love all of my rifles for coyote hunting
. But if I had to choose... it would probably have to be the Ruger m77 in 243 win. with a Nikon buckmaster 3-9x40. My bullet choice is not what most guys would likely use, a 100 gr sp, but I have had great success with this setup and not one dog has taken a single step after being hit and exit wounds have all been small.
My 2nd favorite is a 16" bushmaster with an EOtech shooting hornady 55gr spire points. Maybe not as classy, but dang it is effective. Didn't have close up pics of just the rifles but you get the idea.