In general, a thicker pool liner is better because it is less likely to leak. However, if you are installing the liner yourself, be sure to measure the size of your pool accurately so that you don't order a liner that is too large or too small.

A thicker pool liner is not always better. In some cases, a thicker pool liner can make it more difficult to install and can lead to wrinkles in the liner. It's important to choose a pool liner that is the right thickness for your pool.