It all depends on your venue. I sell prints through a couple of local gift shops; some are mounted & matted, some framed, some large panos mounted on boards, and some as greeting cards. My town is not at all art oriented, so I sell lots more $4 cards than I do $200 large framed prints or panos. The average size and price of sales is noticeably higher at art/craft shows, as you're selling to a different audience. There's no substitute for seeing what works by experience in your specific market.
Just from my experience, people are much more likely to buy a nice print they can examine than they are to order from a thumbnail in a catalogue. There are exceptions; I do have a handful of popular images I print to order after people ask for them.
