Reformed versus By-Roll Pond Liner

We are just now starting to plan our pond and are looking at the preformed
liners like you can get at Home Depot and Lowes, versus the flexible liner
by the roll. We want to put in a pond with a smaller upper pond that flows
via a short "creek" to a large lower pond. What are the differences in:

Installation labor?
Costs?
Durability?
Looks?
etc.

Any input would be greatly appreciated!