the big problem with qrcodes is they're only good for 1024 characters or so. at least the software I tried only let me make a text string that long but not longer. that's not good enough. I need way more than that.
This site puts the maximum at 4296 alphanumeric characters.
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Further, you can print multiple pages if you need more data (split it up and save each chunk as a QR code) and even adjust for less pages (but more error-prone due to smaller squares) or better readability in the future, but using more pages. I would never trust 27 pieces of paper of plain text without checksum or error correction. The probability that a corner catches some humidity and rots away or similar, is too high. There are even insects and stuff that destroy paper.