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The question here is not really a matter of better or worse but actually of making sure your manufacturer knows what the actual bottom situation is. As a manufacturer we can make a liner to fit just about anything, in fact we are receiving more and more requests to make liners for concrete pools that would cost too much to make watertight using conventional concrete repair methods. These pools are really "dished out" as you said. When ordering any custom product, you can never provide too much information. Tell your manufacturer what you have on site and let them determine the best product design to meet your needs. From a measuring standpoint, Jesse's comment is also a good method of aiding in measuring these types of pools as long as you do not add too much water to the pool causing undue stretch. If you have any additional questions we are always there to help.
Best Regards,
T.J. Moreland
Merlin Industries, Inc.
The liner will fit exactly the same whether the hopper pad is perfectly flat or has a slightly sunken middle, assuming the contour of the pad is defined. You've got to think about the span from one side to the other. Lets say the pad is 6' wide and it's 3" deeper in the middle of the pad. The distance from one edge, to the other along the curve of the pad is 6' - 0 5/16" so you're only picking up a hair more than 1/4" over 6' which is nothing. (fyi: 6" deeper middle adds 1 5/16")
If the contour of the pad is not defined (i.e. rounded hopper pad transitions) you may have fit issues (depending on the manufacturer of the liner) unless you specify that it is a rounded hopper pad. Most manufacturers design the liner with sharp corners that are supposed to land perfectly in the corners of the hopper pad, when they don't have hopper pad corners (or if they just are off by a couple inches); you get little eye-ball looking wrinkles where the corners were supposed to be.
(that was the wind-up...here's the pitch)
We at Kayden Manufacturing use that very principle, as one of the factors, in producing a full fitting liner that's easy to install.
Great technique Jesse. Are you in the "Pool Dealer Resources" group?
www.kaydenmfg.com