Whatever is cheapest and long enough to fit the intended rifle
I dont put a whole lot of thought into soft cases.. I only use them to protect the rifle/shotgun while bouncing around in the UTV or a truck.. I maintain control of how the rifle is stored on the UTV/truck and usually have a hand on the rifle while in the UTV/Truck unless I am the driver.. so anything that is reasonably padded works for me.. I then generously coat them with 3M weather proofing spray to help keep water from penetrating on those days that are rainy/snowy, etc..
I do intend on having a nice soft case made from a couple of my hides at some point.. I just havent gotten around to making that happen.. but that will be for range days, and not for hunting (Im not throwing a several hundred dollar, custom case that has hair on hide exposed on the outside on the UTV so that it can get splashed with mud, rain, etc as I go bouncing down the trail)..