Usually planes have a decent catalogue (remember this was a bugged entertainment system on one flight) and if we are talking about watching on a phone quality doesn't matter (if anything plane screen is bigger).
That has not been my experience unless you like a random selection of the latest big-budget movies mixed with weird artsy films.
> and if we are talking about watching on a phone quality doesn't matter (if anything plane screen is bigger).
Physically bigger (compared to a phone) but almost guaranteed to be lower resolution, have worse colors and contrast and the touch controls are barely working. You can also bring a tablet or laptop if you prefer a larger screen.
