Neither, get yourself a 450 Bushmaster and have amazing accuracy and the power to kill literally anything out to 200 yards and even further. Check out Texas Sheep Dawgs videos on You Tube. He's getting complete penetration on 7/16 steel plate from 50 yards with his hand loads. There are guys who have taken grizzlys with one shot. We call it the "BOOM,FLOP" effect. Ammo is cheaper and easier to find than either the SOCOM or .50 . For a big bore AR15 it's the only way to fly.
"An unarmed man can only flee from evil, but evil is not overcome by fleeing from it"