It might be hard to decide online only, but you can read on different papers, what sort of whitepoints they have, how glossy they are and so on, and what looks best in what type of papers. But ofc its best if you can try them yourself.

I have been testing different papers at home, and have decided that i will use Hähnemuehle Photorag for matte stuff and Photograg Baryta for more glossy. I think that combo will satisfy all. Basically matte for more subdued and pastel like colors, that are not high contrast and high saturation, and Baryta or other bit glossier for other stuff. But ofc if something looks good on metallic (paper by hähnemuehle) and a print shop offer it, that could also be included for some works. If something is like super high contrast with super deep colors and blacks, then some even more glossy paper would work instead of Baryta, but it would work very nicely for almost all that dont like matte.

There are tons of different papers, some of them have more differences than others. If in doubt or you dont want to make your offerings simple, yet effective, i think the photorag + photorag baryta combo works well. Super glossy papers also have stronger reflections, so even if a photo would look tiny bit better on super glossy paper, it could be that bit less glossy, but still glossy Baryta paper actually looks better on the wall of the customer.

Also keep in mind that customers wont know about different papers, they only know if it looks good on their hands and wall or not. Your customers are not photographers who obsess over papers!