Just a comparison on battery size, flight time, and weight. The 4000 mAh obviously lasted longer, but not too much more than the 3300. Personally I'd probably fly the 3300 as a happy medium between weight and flight time.
Hope it helps others who are curious about this.
2200 - 173g
2250 = 181g
3300 = 268g
4000 = 346g