Threads/questions like this are really hard to respond to... There is no definitive answer to the question "what stat(s) are best?".
However, if THIS is what you mean:
"If I had to choose a specific gemming/forging strategy and stick with it for every fight w/o swapping on a per-fight basis, what would be the best choice?"
The best answer, imo (at your level of gear), would be to gem/forge for mastery while keeping bonuses. That means 40mastery in yellows, 20mastery20parry in reds, 20mastery30stam in blues. Make sure mastery is on every piece of gear (default or forged) and keep parry ~2-3% higher than dodge. Get yourself the mirror of broken images from TB and a stamina trinket, pref the one off magmaw. 65mastery on gloves, lavawalker on boots, 50mastery on shield, austere meta in helm.

