How does Trainer Difficulty in Zwift affect your ride?

In this video I am trying a Zwift climb with different Trainer Difficulty. How does adjusting this affect the ride?
/ mattiasgriot
/ strava
Music I use is from
www.epidemicsou...
Panasonic Lumix G80
Panasonic Lumix 12-60mm f/3.5-5.6
Panasonic Lumix 25mm f/1.7
Panasonic Lumix 45-150mm
Samyang MF 10mmf/2.8
Pentacon 50mm f/1.8
Sony Xperia 5III
DJI Osmo Action
DJI RS3 Mini Gimbal