Both will do a good job. It depends, of course, on the kind of subjects and the look you want. Gold has somewhat higher saturation than Portra, and a somewhat rougher look. It may be excellent for street scenes, rough urban architecture, and the like. Portra may be better for more pictorial shots and people where skin tone is of great importance. The obvious answer is to go out one day and shoot a roll of each, then see which one you like better.