Quick and easy isn't always safe. Yes, the HSS vest is easier, BUT the older HSS leg straps anchor in the front-middle instead of the sides. A Front-middle anchor will split your legs in two (or you will think it did if you experience a fall in it) instead of transfering the weight of your fall to your buttocks and thighs (the biggest muscles/bones in your body) where you want that force to go.
The newer HSS's are anchored on the side (good), BUT get the model that has a strap across the chest to hold the shoulder straps together (and on your shoulders) in a forward-head-first fall. A F-H-F-Fall w/o a chest strap will peel that harness right off your shoulders and off your waist/legs like pulling a sock off your foot (not good). The SOP is a great harness (I love my original model), is harder to use, light wt., and has the leg straps properly designed, BUT no chest strap (I added one to improve mine). The Muddy has both features, side-anchor leg straps, and a chest strap. Buy the Muddy, if you're not comfortable with an added-on chest strap.
No harness is designed to prevent you from injury, but the goal is to keep you alive. The harnesses with the best designs may let you walk again, the others won't, if you live through it.
A good harness is cheap insurance, buy the best design and use it properly, ALWAYS, even going up to hang a fixed stand.
83% of people who fall 11 feet or more, DIE.
And as WHUMP always used to say..."Hunt safe"