I would like to write down my seed phrase but I am hesitating between writing it on a sheet with a pen or typing it on my notepad app on my computer and print it ?
Which one will last longer ?
Writing seed words on piece of paper is always a better option than keeping digital copy, but if you really want something that will last for a long time use metal plates.
Metal plates should be from stainless steel or you can make cheap DIY version of backup using washers you can buy in your local store.
I don't trust printer ink is going to be good enough because it can use cheap ink color and that can fade fairly quickly like those receipt bills.