I was told today i have severe cervical dysplasia. which treatment choice is better hysterectomy or leep?

Depends: A leep is much less invasive and usually an effective treatment. It can be performed in the office with local anesthesia. A hysterectomy can also be performed and may make more sense in certain circumstances. If you have other medical issues that could be addressed by having a hysterectomy and you are finished with childbearing then a hysterectomy could be a better choice.