Ray -
I'm not a big print maker. What I know about the issues is what I've read on
http://www.dpreview.com and
http://www.luminous-landscape.com and a few other sites. The best idea (IMO) would be for you to spend some time on those sites and read the input of photographers who print large every day and often make their livings doing it.
My input is unfortunately hampered by my less than excellent memory, but here's a couple of impressions that I've come away with.
Wet prints are not superior to dry prints. There may be a few techniques that one can only do with wet printing, very high gloss wet prints seem to look better (especially the black areas) when looked at from an angle. Once you put them behind glass the difference disappears.
Let's leave you to pursue the more esoteric issues. You can ask those who are doing it. Some people are shooting digitally or scanning their film, doing their 'darkroom' work in the computer, printing a large 'negative' in inkjet, and making contact prints.
For the rest of us printing is something that we have done. These days if you shoot film for the most part you get digital prints. Your film is developed and then scanned into digital format. Those digital files then enter the same print stream as files that originated from digital cameras.
They're printed on real photo paper. Ritz ($9.99), Costco ($2.99), and the place that charges you $37.98 are most likely using the exact same Fuji Frontier, Noritsu, Agfa, etc. printing equipment to make those prints.
The more expensive places may use a heavier grade paper. That may feel better to the customer. It probably makes no difference once mounted.