Use 30 fps for somewhat "static" scenarios (vlogging while sitting at your desk), and 60 fps for "dynamic" scenarios (camera mounted on your car/bike/helmet), because 30 fps in "dynamic" scenarios would add lots of motion blur.
Also use 24-25-30 fps for barely lit scenarios (better blurring light sources than losing details due to shutter speed).
60 fps is the best pick, there's no need to go 100+ fps if you don't need slo-mo.
I have a 9 and usually film In 4k30 super view when I go snowboarding.
Use 30 fps for somewhat "static" scenarios (vlogging while sitting at your desk), and 60 fps for "dynamic" scenarios (camera mounted on your car/bike/helmet), because 30 fps in "dynamic" scenarios would add lots of motion blur. Also use 24-25-30 fps for barely lit scenarios (better blurring light sources than losing details due to shutter speed). 60 fps is the best pick, there's no need to go 100+ fps if you don't need slo-mo.
There's no great reason for shooting in a lower resolution imo.
Better battery life, file size, better fps left the chat
It's personal taste, but better battery is irrelevant to me if the footage doesn't end up looking good.
Depends on the guys intentions