I have found the Prestige works best with the shortest chain possible. I tend to use 14-22 or 14-24 freewheel with 40-52 or 45-52 chainrings. I get the best shifting from a chain that is tight, no extra links. Suntour and other slant parallelogram derailleurs can wrap up a lot of chain and chain length isn't as critical.

As long as the granny gear is not used with the 14 or 17 cog I think you will be fine. The long cage Prestige would be the way to go with your setup though. It can wrap up a lot of chain and it has a lighter touch when shifting.