I used to use my Brother 3-in-1 laser printer, and that works OK.
Of late, since I get almost zero paper documents that need to be scanned/kept (all my bills are e-bills these days), I have switched to using the iPhone's Notes app, as don't need to fire up the computer and or can do scans in the moment. Easy to crop the scan as needed, generate a PDF from that, save to Dropbox. When back on the Mac, can then do things like add meta data to the PDF via Preview for search purposes. Things like receipts, I "print" the PDF to PDF with a layout of 4 pages per sheet, in the odd case that someday I will print to paper and don't want to waste paper.
The Dropbox app also has a built-in scanner. That's a really nice one in that you can adjust the scan quality, to shrink the size of the PDFs, however, it's quirky in that it might generate a scan that's landscape vs portrait. And when combined with other scans and my 4-per method, get odd PDFs where one panel is portrait, next two panels are landscape.
There are many OCR scanners for iPhone/iPad, have not tried them as OCR has not been a big need for me.
Then again, my needs are pretty simple. And once my taxes are filed, I encrypt and archive that year's data and take off the computer. Not going back to look at anything unless I get a love note from the IRS. About the only thing I keep on the Mac is my collection of recipes, where Spotlight search will find in the PDF text (I make a table of contents for each "cookbook" I have).