From another point of view:
The P3A is about 15% faster than the Spark.
Ascent speed on P3A is 5 m/s, Spark is 3 m/s.
Descent speed is 3 m/s on both.
P3A 23 minute flight time, Spark 16 minute flight time (dji advertised times).
RC response is similar but Spark seems peppier because if its small size.
The Spark's range is great enough to fly beyond visual line of sight, which is illegal in the US and many other countries.
Spark has forward obstacle avoidance.
Almost anybody, with 10 minutes of instruction, can get in the air with a Spark and take pretty good 1080p video and 3968x2976 still photos without having to deal with any camera adjustments. According to many home theater experts the average viewer can't tell the difference in 1080p and 4k at typical viewing distances. For some people and in some situations "pretty good" is good enough.
My Spark flew in 20 knot breeze today. I confess, I didn't stay up too long because it was less fun than a more calm day would have been. Yes, my
P4P could have dealt with the wind with no problem.
The Spark is not a professional photographer's or videographer's drone, but it can certainly do a lot and be a lot of fun for such a small package.