Hello again Photozilla,
Most of my viewing of photos is digital, rather than printed, so I typically don't bother too much about DPI settings. You're right, for printing it matters!
Take a look at the full resolution comparison image on
this page.
300dpi is fairly standard for most home printers. Photos imported from my various cameras range from 72dpi (phone) to 300/350dpi (DSLRs).
Are you printing at home? or having prints done commercially? If the latter, they may have particular requirements, & I'd definitely consult the "experts".
In general, my (lay) view would be to export at the highest quality settings available, whether it's for digital or print viewing. Giving the device/printer as much photo information/detail as possible allows it to produce the best image.
If you're printing directly from PhD, you may have noticed that the resolution setting is listed as ppi. I can't explain that, as I always understood that DPI related to printing & PPI referred to digital images. Perhaps I'm mistaken (it's happened many times before!).
PIX
PIX YouTube channel