I'm coming at this with the approach of being a huge fan of the original anime run and never seeing the Rebuilds at all, just for reference.

Long story short: The manga adaptation is just fine.

There are some elements which are done really well and I would say much better than the anime did: this includes some more character development for many of the characters that helps make their character more nuanced and easy to identify with. There also is more credence given to the many connections Shinji could have as someone who is canonically bisexual, giving the reader more opportunities to connect with Shinji in the way that Anno seems to have intended for the viewer (or in this case, reader) to engage with him.

And yet, there are some elements which are more or less bastardized here. There's a very certain relationship late in the anime which gets even more overlooked and neglected in the manga adaptation which severely disappoints me. If you like positive representation of gay romance in your manga, I wouldn't invest too heavily here because while there is more time the characters in question spend together than in the anime, it is borderline infuriating at some points seeing how Sadamoto handed their connection given the many versions of this relationship which was shelved in production due to the kind of censorship and concern which the manga was supposed to remove.

This is a problem across a lot of the manga adaptations of Evangelion: the only place it seems like it could potentially be better is in Angelic Days but I haven't read that for myself so I can neither confirm nor deny.

If this is your first rodeo with Evangelion, watch the anime first. Please.

If you're curious to see Evangelion in manga form, this will do just fine and provides a unique enough experience from the original to make it worth the read.