Don't know just what 4 in 1 screwdriver you have from wall mart. But I have tried many 4 in 1 type screwdrivers from different hardware stores over the years and they don't come close to how well the Super 8 is built.
I find the weakest part of most 4 in 1 type screwdrivers is the nut driver part. The nut drivers on the Super 8 are very nice, heavy duty.