You'll probably get a lot of different opinions, but you're right, it comes down to personal preference and how you intend to hunt coyotes. Do you plan on keeping the pelts? If so, the 204, 223, 222, etc, would be good choices. Will you be calling? You may not need a rifle with as much range if you do. A 243 or 25-06 will hammer them way out there, but might leave a lot of pelt damage.