I have a 512gb because I got it for a good deal (few weeks old with pencil and keyboard for the same price as a new 64)... I think I use like 50gb at max, with a bunch of useless crap on there.
If I was buying brand new right now I'd only buy a 128gb. The old 64gb was not enough, but 128 definitely is.
My iPad also isn't my main device though, It's basically just my note-pad and in class computer for when I don't feel like packing the MBP. I have a 1tb MBP that I keep most stuff on, and a 10tb Pi NAS cloud system I built, as well as a 2tb time machine, so I've never really worried about storage constraints.
If I was buying brand new right now I'd only buy a 128gb. The old 64gb was not enough, but 128 definitely is.
My iPad also isn't my main device though, It's basically just my note-pad and in class computer for when I don't feel like packing the MBP. I have a 1tb MBP that I keep most stuff on, and a 10tb Pi NAS cloud system I built, as well as a 2tb time machine, so I've never really worried about storage constraints.