Does curly or straight hair look better on women ?

Straight on the drapes, curly on the carpet.

Most people look more attractive with curly hair, but only if they are taking care of their curls correctly. However, there is the exception where some people look a lot better with straight hair than with curly hair. It has a lot to do with the style, thickness of the hair, and the shape of their faces.

If a woman doesn't like the way their hair looks naturally, they're allowed to change it. It's their hair, they can do what they want with it. 

Some women have good looking natural curls. While women I've seen have frizzy, poufy and dry curly hair some women don't like that look.

I have decent looking curly hair. I've bleached, permed and dyed my hair, I don't do that any more. I still dye it to cover gray hairs, but I wear my hair naturally curly most of the time. 

What you think of as best depends upon your own preference. 

If you're talking about yourself then it depends upon many things: your natural hair type, how much effort you're willing to put into changing it and maintaining it, etc.

The best hair for any/every woman is the type/texture/curl pattern that is naturally growing out of her head. 

When women with extremely curly hair attempt to chemically "relax" and/or straighten with heat + harsh products, the hair never ends up looking like they imagine it will. Even if she manages to get her naturally textured hair flattened straight (after several hours+ of working on it), the moment she walks outdoors (into humidity, etc.) her hair will turn into an unbecoming combination of fuzz+straight. If she had kept her natural curl pattern, it would still look great.

Naturally bone straight hair may be curled, chemically permed, crimped with heat, and tortured into having texture but again, walking out into the elements will result in limply curled (but extremely damaged) hay. 

The worst look any woman can sport is fried, over-processed hair. Extreme heat + any sodium hydroxide "relaxers" or perms turn the hair into a porous mess that will likely result in a very unattractive chemical haircut (where the hair breaks off at its weakest point - typically where the new growth meets the overly-processed hair = leaving 1-2 inches left and in some cases, bald). Heartbreaking.  

Healthy, shiny, conditioned hair is the very best look.

It depends on the female. Face shape, hair colour etc. 

I vastly prefer the look of straight hair. 

i think they both look good on them

neither. bald women.

For me it depends on other features. Some faces do go better with curly hair than others. And some look good with either.