I went with the 1/2 stubby because all my impact sockets are 1/2. Same with my universal sockets - all 1/2. The 1/2 and 3/8 have the same power specs, but i preferred not having to buy all new impact sockets for a 3/8 stubby impact, so i just got the 1/2. It's got 250 ft/lb of torque, so it's...