I haven't tried the SOG snips just yet, but from what I can tell it is a pretty small tool designed more for cutting light electrical wire than heavy gauge fencing.
I have had to cut through standard chainlink several times, and all of those times a good full sized multi-tool has handled the job (provided I used the hardwire cutter notch). Most of this was done a few years ago with my old Super Tool 200. However, I have no doubt that the compound leverage of the SOG Powerlock would ease right through standard gauge fencing. That would be my first choice.
Even my fairly small Leatherman Skeletool will handle a pretty beefy metal hanger (the kind rental shirts come on) without any trouble. The key is the hardwire cutting notch. My mother, bless her, ruined my first Leatherman Wave by using it cut hardwire with the soft wire cutters....jammed the damn thing up:grumpy: But, it's Mom. What ya gonna do?