Sun Mountain all the way. i love my Four5. I had an Ogio Vaporlite and the legs were terrible. It was always falling over. Gave it to a friend when I moved and kept the Four5. Never tried the Ping Hoofer, but I've read nothing but great reviews about it.
My take is this (from personal experience and working in a golf store for 4 years several years ago).
Sun Mountain bags are a great mix of lightweight and durability.
Ogio bags are heavier but, generally, hold up better and have more features.
PING bags will last forever but are frustrating as **** to use. The leg system is goofy, the strap system is odd and the clubs seem to always get stuck towards the end.
I have a PING but will soon be switching to Sun Mountain or Ogio.
Call me odd, but I'll sacrifice 1-1.5 pounds of weight if the club organization and ergonomics of the bag are good. I think that may be why I get along with Ogio so well. The oblong/oval shape of their bags fits my back nicely and I much prefer the single-piece, double-strap. My wife's Callaway Dayrtipper II (Ogio) is a VERY nice bag. Heck, I'm contemplating giving it a whirl this season because of the strap design and Wood-E club management. Yes, it is 1-1.5 lbs. heavier than my PING but I don't think my back will notice.