The show very much feels like Invincible did in its later arcs. The stakes were higher, violence was more visceral, and the pacing much more focused. Early issues were still trying to find their footing, so the show having a better idea of what the cast would become in the comic is a nice change. They're also sticking far more closely to the source material than The Boys while recharacterizing and recontextualizing some events, which IMO is a good thing (invincible has a solid foundation, but The Boys as a straight adaptation would be unwatchable).
Changing a lot of regulars from the extremely white cast of the comic to POC was also a smart move. Not to mention making William's sexuality unambiguous from the get-go, as opposed him making multiple homophobic jokes before the writers wrote in a single line saying he's gay.
Moreover, the whole cast gets so much more time to breathe and develop as characters. The biggest change by far is Omni-Man, who gets several new scenes (and some expanded old ones) showing just how cruel and vicious he really is. The comic didn't have a hard time selling him as a villain, because he doesn't get more than a handful of moments to be a hero. The show taking time to establish him as a genuine father figure to Mark and keeping him around long after he left Earth in the comic was a great call; in the comic, Mark started working for Cecil to support him and his mom after Omni-Man murdered the Guardians, clashed with Immortal, nearly killed Mark, and left the planet. In the show, Mark starts working for Cecil because his dad's in a coma, meaning their eventual fallout may take on a very different tone. Really excited to see where it goes. Also, loved Seth Rogen as Allen.