I like both. In my opinion the Impulse 2 has more power available for really steep hills and as a crank drive can deliver full assist right down to 3 or 4mph. No hub drive can do this, even the Panasonic. This is particularly important if you live in a hilly area and you are not a lightweight. If you're light, the Panasonic will probably take you up most hills without slowing down that much.