i haven't used the hip one but do use a ring sling for hip carrying just wanted to add that the sling should go completely over your shoulder actually more like upper arm and the cloth spread right out, then it distributes the weight through your thoracic back not lumbar and definately not neck/shoulder. i see lots of people wearing them incorrectly which no doubt would cause lots of neck pain. just thought i'd mention it to see if this was the case for you
beckles