Regarding of what's better: Ink can take several decades to start fading. Pencilled material can last over a century. Even if you didn't know this, just stick with both; write your seed phrase twice, backwards and forwards. The quality of the paper should be your main concern.
As for this:
typing it on my notepad app on my computer and print it ?
I think we've over-analyzed it. It's easier and safer to avoid using a printer as it introduces additional risk for no reason.
But again, as I discussed above regarding steel back ups, I find this unnecessary.
Not only unnecessary; I personally find it worse. Metal detectors can detect those.