Many games will use more VRAM if more is available. Absolute usage figures are hard to compare, and how using more VRAM translates into a performance advantage is hard to judge. Ultimately the benchmarks should tell you if it really matters. Of course if you have special needs that warrant more VRAM for you, then that may be a good option. But for the average person, the answer "more VRAM is always better" is not quite so clear cut.