The Duqusene Incline has the better photography angles, but no way is Duquesne the bigger tourist draw.
You have to think like a tourist. The Mon incline is right across from Station Square..you can park there, cross the street, go up and walk up and down the Grandview Ave sidewalk with wide open views and multiple viewing decks. There is nothing at the bottom of the Duquesne incline, nor really at the top...tourists aren't going up the incline to eat at the LeMont. The sidewalk on that section is really boxed in by buildings and houses affording few views.
The Mon incline, if you connect it to Station Square a little better...the Gateway Clippers are right there too, you take it up for the views...the whole stretch of Grandview is almost like a boardwalk...it should be Pittsburgh's boardwalk....lots of people walking around that street at night...they could make the Shiloh Street Shops a bigger thing.
Grandview should be nurtured to be more of a boardwalk type of place....at least with more shops up there. It is really a wasted opportunity right now...always has been. The whole stretch of Grandview between the two inclines should be considered so you can park at one or the other take one up, ride the other down, and have some stuff in between (I'm talking about things like ice cream shops or something).
Regardless, they can build additional transportation options to get down the hills, but if they alter the Mon incline, they are beyond short sighted.