Which would you describe as "stickier": a polar molecule or a nonpolar one?
The polar molecules is "stickier#
non polar molecules have no ( or very little) difference in the electronegativity or are completely symmetrical. There is no or very little attraction between the molecules of a non polar molecule.
Conversely water is highly polar. One part of water (Hydrogen) has a partial positive charge, while the other part of water (Oxygen) has a partial negative charge. This causes one water molecular to "stick" to another water molecule. Because of this water is a liquid between temperatures of