Overall, Trigun Stampede adheres closely to the manga. Some minor details might differ for the sake of the adaptation's flow and visual presentation, but the core remains the same.
The Trigun manga has a considerable length. It consists of multiple volumes and chapters, but the exact number can vary depending on the specific edition and printing.
You can try looking on popular streaming platforms like Netflix or Amazon Prime Video. They often have a wide range of shows and movies, including magical love stories.
It's hard to say which is better. The Trigun anime offers a dynamic viewing experience, but the manga has the advantage of presenting the story exactly as the creator intended, without any adaptations or changes.