Dargo, as little as I actually get into the pool, my preference is to save the money and put in a liner pool. But to give you an idea on the pricing of JUST a liner pool versus JUST a fiberglass tub . . . the 'basic' materials for an 18x39 liner pool are under $6000. The 'basic' fiberglass pool at roughly 16'x38' is about $18,000. Neither of those prices includes heater, filter, pump, plumbing, labor for installation, etc. Just the basic material for the pool itself. So in either case, add roughly $12,000 to the basic price and you are sitting with a very basic low end in-ground pool install.