“Which type of hepatitis is most common in patients?”

Hepatitis B (chronic). Despite having a vaccine, over 292 million people have the disease worldwide, making this the most common liver infection.

There are many types of hepatitis. Not sure if you are asking about infectious hepatitis or noninfectious types, but for viral causes, you can see a lot of data online:

https://www.hhs.gov/hepatitis/learn-about-viral-hepatitis/data-and-trends/index.html

https://www.cdc.gov/hepatitis/global/index.htm