The title is a little misleading because "Vs." is not accurate. Straights and curves in drawing, art or nature are not enemies nor opposites, but rather compliments that give each other meaning.
Straights and curves are tools that the artist can use to help create a greater sense of balance in their art.
Often I like to talk about the watery rhythm that exists and can be seen in nature and of course the figure. I like to use this diagram of the opposite C's to help expose that rhythm. Drawing master Glenn Vilppu likes to call these curves a "school of fish", some liken it to "skiing down a slope."
These curves here definitely show movement but are ultimately meaningless without some form of structure to hold it together.
But see, "voila!!"
With the structure added suddenly now we have form, context and possibly application!
American animation studios taught this as "Appealing Design". Straights and curves working together, supporting each other in design. Don't be so dogmatic about what exactly is a "straight" and what is a "curve"! It's all relative!
Please take time to view veteran Disney animator and artist Aaron Blaise's video on "Straights and Curves".
I am attaching including some other examples below for your artistic and inspirational enrichment!