Your armory is in PvP gear atm so I can't really give proper feedback but I'll try...
Based on my own gear and stat weights. After optimizing reforging and gems assuming I had picked both items. Also assuming I had not upgraded either item.
My gear is like 0.039% better if I pick Ruby-Linked Girdle rather than Belt of Malleable Amber. In other words for me it really doesn't matter which I pick since we can customize our gear so much now.
Take that for what you will in terms of your gear.