Most non lifters do better from hang/ blocks because they can't do the first pull correctly.
First pull = From floor to the mid thigh for the start of the 2nd pull
Due to the above issue they generally lift less from the floor. From Hang/ blocks negates having to do the 1st pull.
Most lifters will be able to lift more from the floor due to having momentum witht he bar already like olylifter106 has pointed out already. But you get a few freaks etc and they are wearing straps as well for hang/ block work in general so that helps them as well.