It depends on your taste. Gantz has some intense action and a complex story, but it can be quite violent and dark for some. If you like that kind of stuff, it's great.
Well, an omnibus in the world of comics is basically a single book that brings together a bunch of separate comic issues or volumes. It makes it convenient for readers to have a chunk of related content in one place. It can save you from having to hunt down individual issues.
A manga omnibus is basically a collection of several volumes of a manga series in one book. It's convenient if you want to have multiple parts of the story in one place.
It depends. If you're a die-hard fan and want to have a comprehensive collection of a series, they can be worth it. But if you're just casually interested, it might not be the best investment.
Basically, a comic omnibus gathers a series of related comic books together. It might include an entire story arc or a significant portion of a comic series. It saves you from having to hunt down individual issues.
Basically, an omnibus comic compiles several related comic installments into a single publication. This could be a series of individual issues or a group of smaller volumes. It saves you from having to hunt down separate comics and gives you a comprehensive reading experience.