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.
The Preacher comics ended with a complex and somewhat controversial finale. The main characters' fates were resolved in a way that left some fans satisfied and others with mixed feelings.