Hi, I'm Shamim Hossain
Answer some questions and I will help you to figure out the right CSS unit for your project.
Assuming you are only using these units for web development, not for print media.
vh svh dvh 1vh
These are all Viewport Height units, with the first one being just that, the second being the small viewport height, then the dynamic viewport height. If you're unfamiliar with these, you can learn more about them in this video.