Maybe offer both for a while and decide based on buyer feedback? Send a few to your large and usual customers and let them pick? I'm thinking internet is not the best medium to make informed decision on something this subjective, especially when we can't see the product ourselves.....
Sometimes it doesn’t matter what we want. I had a 15 month, thirty picture, museum show of 7x17 contact prints in 23 7/16” x 14 1/8” mats and Nielsen frames. They said we will buy mats, frames and museum glass. I said thank you.