Just to clarify, glass thickness does not directly relate to what pressure you can hold. The dimension of the bottle/container is also a factor. As you increase the diameter of the container you need thicker sidewalls to hold the same pressure. The thickness of glass has a force/thickness...
The Chillzilla is only 15 ft in length at most! For the price difference you can make a longer coil and the effects of turbulent flow vs laminar will be irrelevant.