Best format to save Photoshop artwork for printing?

I am creating artwork to sell on etsy and I use photoshop for my designs, but I'm a bit lost as to what format I should output the images to. I need them to retain a high quality for printing, but not be too huge in terms of file size. I'm thinking pdf would be best as there isn't as much compression as a jpeg, but I'm unsure of what pdf settings to output to (or if there's a better alternative). These are files that can be downloaded by anyone, anywhere, and will be printed on anything from home printers to professional copy shops, so I need a standard setting - if one exists. Any help appreciated! Thanks!