I like the HSS vest because of the ease of putting it on or taking it off. It is heavier than some, especially since I usually have stuff in the pockets, but I don't have any issues with walking in it. It's comfortable and I feel safe in it. I wish the lineman's loops were a little farther forward and the zipper stuck and won't open on one pocket. Thankfully it is empty. Otherwise I can't complain.
My son has a Gorilla, I think. It is certainly light, but I don't want to have to go through the gyrations he does to put it on. I also like that the HSS clicks, so I know the buckles are locked.
Whichever one you prefer, WEAR IT! Left in the truck, none of them are worth a hoot!