60,000,000,000$$ man who is a pacifist. Even that short sentence gives it all. But why would a guy like him be worth so much? Well it's for you, reader, to uncover.
Manga Trigun is a mix-up of future and western.
The story behind it is quite good, although it can be a bit confusing. When you finally add everything, it's not as good as it could be, but nonetheless it's worth reading.
Art is slightly worse, just because sometimes, while Vash is struggling against others, you don't really know what happened. Also the art itself is not incredible, but it's not that important.
Now we enter the pride of Trigun, characters that were introduced in manga. Every person important to the plot is presented so well, that we can almost imagine them as real. Vash, the main protagonist, is depicted far more, then characters in other series. He has human feelings and thoughts, which almost everytime he tries to hide from others.
Trigun is well balanced, so while there are some sad moments, they're just the night before the dawn. You rarely have time to be bored, because with every story, you uncover the real profile of the 60,000,000,000$$ bounty, Vash the Stampede.
To sum up, Trigun is almost a must have on your manga (or anime) list. If you have not at least tried to read/watch it, now is your chance.