Me and my wife would like to know how do we pick the right pool liner that would give us the desired "resort blue" pool color which is very important to us, our pool installer doesn't seem to know which one gives us that color.

I think the "resort blue" is a picture you have in your minds eye and not anything you'll see advertised at a pool supply store. There really aren't all that many different colors but some have a pebble looking floor and some are a deeper blue than others. I'd suggest you shop at the biggest and best pool supply store just to see what's available, you don't have to buy from them but they'd have a larger selection to choose from.