I assume you don't own an action cam.
There is no comparison.
Easiness to hold and wide FOV are game changers.
I often record for 5-10 minute chunks. Holding my phone for that amount of time while walking around would suck.
A phone is great for a 30 second video clip here and there. but if you really want to record a whole day of activity a phone sucks to use.
In my most recent trip i took 4 hours of footage over 10 days. I would never enjoy doing that on my phone.