I have both. I like both birds for different reasons. The Spark has a much more precise feel in the air and is less susceptible to wind. The smaller size is much better in tight spaces. The application offers many options not found on the Q500. The Spark has a forward sensor that works very well. However, the camera quality is marginal. The Q500 offers a raw mode for photos giving far better quality. The Q500 offers 4k video. The larger bird is also much easier to see it's orientation. I recommend both for their own advantages. If forced to choose, I would keep the Q500.