Gearing, on its own, doesn't matter. What matters is putting in enough time at a moderate/easy intensity at a moderate to high cadence. If it's flat where you train, then you may very well need the big ring to keep your cadence below 100rpm, especially if there's a tailwind. On the other hand, if you train in hilly territory, you are most certainly going to spend a lot of time in the small ring to keep cadence high enough.
So forget about gears and concentrate on the right intensity and cadence.