The Cell will handle higher volumes of oil and cut through carrydown. The Gravity Shift will bump off the dry more aggressively and with more angularity -- it is rolly for a strong pearl, but it's still a pearl, which means more skid in oil, more response to dry. Both are pretty continuous, but the Cell even more so than the Gravity Shift. They do complement each other pretty well. Use the Cell when the Gravity Shift won't read the lane early enough, use the Gravity when the Cell starts burning up or you have to move too far inside. This should cover medium to heavy conditions well, but both are too strong for lighter oil really.
