Guyver has always been one of my favorite series', since it was my first series and I've been watching it since I was 3 years old (the old 12 episode OVA that I has on VHS that is). When I first picked up the DVD version of this remake, I noticed quite a few differences. There are some story differences, but the creators dub this Guyver reboot as the "most complete and most like the manga". True this reboot is the most complete, but it is not the most similar to the manga.
Besides some story differences, which I assume were put in to try and differentiate this newer version from the 1980's-1990's OVA, the art style is completely different from that of the manga and the original OVA. The art style of the old OVA series is sketchier, and has so much more detail on character designs and scenery. This new art style is like the creators conforming to the anime standard, which is less details, more simplistic lines and shapes. It's like comparing the art style of the first episode of DragonBall to the last episode of DragonBall Z. Instead of rounder shapes, the art style has moved to boxier more linear shapes. I'm not a fan of the new art style used on this Guyver reboot, but it isn't terrible.
The voice acting in this reboot is a lot better, as the American voice actor for Sho Fukamachi does an amazing job of making Sho seem innocent, intelligent, geeky, and goofy but not too goofy (which was my only complaint for the voice actor of the original OVA, as he seemed too whiny). Enough of this comparison between this reboot and the original OVA. This is the more complete version, so I would recommend it.
But now for the debate as for whether this BluRay version is better than the DVD version. I would say the DVD version is better and more complete. I would give the DVD version 5 stars, but it saddens me to give this version a 3. The DVD version simply has so much more extra content than this Blu Ray version. I don't know why they couldn't have made a 4th disc for this set that contained all of the bonus features. The Blu Ray version has one episode commentary. Is it me or that just a bit sad considering how much storage space is on one blu ray disc. The DVD box set comes with multiple episode commentaries, anime to manga comparisons, and comes with little booklets that contain character bios, and history on the series. As for whether which version looks better, I can barely tell since the art style is so simplistic.