The following scanners are my recommendations, based on my personal experience with them, or friends' recommendations.
Best for beginners
The Epson Expression Premium XP-7100 all-in-one printers/scanner is great for those people beginning their genealogy journey, and who also want a printer/copy machine in addition to a scanner.
The scanner has over 2,000 ratings and is a 4.3 ⭐️⭐️⭐️⭐️ star rating on Amazon!
All-in-one scanners like this are great for those people who have a shoebox or two of photos they want to scan.
If I didn't already have an Epson all-in-one, this is the one I would get.
Highest scan dpi: 2400 (8x the minimum recommended 300dpi)
The Epson Perfection V600 Color Photo, Image, Film, Negative & Document Scanner is the go-choice for many genealogists who want a flatbed scanner.
One of the great benefits of a flatbed scanner, versus and all-in-one scanner, is the scanning area is typically much larger so you can scan larger photos and documents easier.
This scanner also has slide/negative attachment to easily scan slides and negatives.
The scanner has almost 5,000 ratings and is a 4.5 ⭐️⭐️⭐️⭐️ star rating on Amazon!
Highest scan dpi: 9600 (32x the minimum recommended 300dpi)
The Epson FastFoto FF-680W Photo Scanning System is an incredible scanner for those who have boxes and boxes of 4x6 or 5x7 photos.
I inherited thousands (literally) of photos from my grandfather from the 80s and 90s and this scanner provides a much faster way of scanning them than a flatbed or all-in-one scanner could ever do!
The scanner has over 1,500 ratings and is a 4.6 ⭐️⭐️⭐️⭐️ star rating on Amazon!
Highest scan dpi: 1200 (4x the minimum recommended 300dpi)
The CZUR ET16 Plus Advances Book & Document Scanner is such an incredible scanner for larger documents and books.
The scanner's technology can take a bound book, scan it, and flatten the pages to look as if they were scanned as individual pages. It includes a 16MP Sony Camera and with the 1.5 S/P scanning speed, ET16 Plus can easily finish scanning a 300 page book within 10 min, which is 10 times faster than traditional scanner.
The scanner has over over 400 ratings and is a 4.2 ⭐️⭐️⭐️⭐️ star rating on Amazon!
Highest scan dpi: 16MP (Unlike a traditional scanner like the ones above, this has a 16MP (megapixel) camera that takes a photo)