Both:
1) Have a pretty good idea of a good take off. Take off action is good.
2) Run squatty – Need to be taller and run with more range especially towards take off
First guy:
1) NEARLY nailed a great landing. But was leaning back too much. Keep torso upright and your landing is great. Would easily be 21+
2) Very good flight mechanics
Second guy:
1) Good landing
2) Over rotated in the flight. Must keep torso upright or slightly leaning back during flight.
3) Good stride frequency but need bigger more rangy strides towards the board