The ENO Guardian is 16oz (I weighed it at 431g including sack and compression straps), and the Warbonnet is 7.5oz. You could trim the weight a little by ditching the sack and compression straps, but the major difference is the fabric; the ENO uses a heavier, super-fine mesh. It's built tough.

Of course, most of my travel is by water, so weight is less important.