I'd recommend two devices that do one thing well (separate printer and scanner) compared to one device that does both things kinda okay. It also means you can upgrade just one of them instead of having to replace both.
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A standalone scanner only really makes sense if you scan a lot of documents. Otherwise an all in one will so just fine.
If you don't scan a lot of documents you can also take pics with your phone and run them through a cleanup & straighten app (aka "scanner" apps).
On most phones the end result will look fairly poor AND it will be a pain in the ass.
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I am not a big fan of this, because you then rely on the scanner manufacturer to produce good quality results.
I scan everything using VueScan and that has a special mode for text documents. A single page with OCR ends up being about 25kb as PDF. It removes folding edges, sharpens the letters, etc.
If that software gets new features, my scanning experience improves automatically, even though I still use the same scanner for 10 years now.
With relying on the firmware, I would have long ago stopped getting updates and I either was ok with the results or I could throw away the whole device.
Just as people here recomment to separate printing from scanning, I recomment to separate the hardware and software.
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