In my opinion, they are. The Preacher comics offer a deep and engaging plot along with excellent artwork. However, it depends on your personal taste in comic genres and storylines.
I don't have the exact figure off the top of my head. The number could vary depending on how you classify different versions and special releases. Maybe do a search on major comic-related platforms to get the most accurate tally.
Preacher is known for its relatively close adaptation to the comics. It does a good job of translating the story and characters from page to screen. There are a few changes here and there, but they don't significantly deviate from the source material and still manage to retain the charm of the comics.
You can try looking for comic preview sections on popular comic websites or apps. Some platforms offer free previews of certain comics to attract readers.