The difference is in the way (mounted together or not) the posters arrive to your customers.
Framed Poster: posters and frames come as two items packaged separately within one package. Your customers need to assemble it.
Ready-to-Hang: posters are placed within frames. Your customers can hang it directly on the wall when receiving it.
You can always find more information about our products in the Product Catalogue section of the Gelato Dashboard.