How do the experts here compare motor kv value and prop size.

I just watched a video of someone who swapped a Leopard 1050 kv motor and a 54mm prop into a sonicwake and claimed 14 minutes run time and no heating on a 6s 5000mah.

I assume power is very little different if the speed calculator shows the same value.

1600 kv with a 40mm prop versus a 1050 kv using a 61mm prop should perform about the same. Is there any advantage of using 1 combo versus the other?