The "new water pipe adapter 14/18mm combo w/ handle” has a glass internal screen and works with both 14mm and 18mm female water pieces.
The "carb tube water pipe adapter 18mm male" has a metal internal screen and only works with 18mm female water pieces. It also allows you to clear your piece of vapour by removing your finger off the carb, instead of removing your vape from the adapter. That also means that you have to keep your finger on the carb during your hit, although you can also feather it if desired.
Which might work best for you would depend on the size of the joints on your water tools and how you want to use your vape, so it’s difficult to make a recommendation. If you’re unsure, buy both!