Material and Sculpt
Out of the package, the material of these figures feels comparable to that of Marvel Legends and other Hasbro collector lines. They are also quite large, and I imagine the Toho Ultimates are going to be way bigger than most people expect. They feel solid and robust, the kind of toy you can throw in a bucket and bring to the beach, as opposed to a more delicate collectible. The sculpts look good, but I don't know how well they'll be able to capture the shark-like (for lack of a better term) texture that Godzilla typically has in the same way that lines like SHMA and NECA can.
Articulation
Super7 has stated for the record multiple times that they value sculpt over articulation. Mutagen Man is a good example of this, as his left arm barely bends at the elbow. Like, maybe 20 degrees at most. This is done to preserve the detail of the metal gauntlet that he has. This really makes me question if a figure like Super Mechagodzilla will be able to bend his arms enough for his Shock Anchors to be depicted properly (they do in the solicitation photos, so hopefully!) I can also see the Heisei suits having limited leg articulation given how big the thighs on the suits typically are. Toxie articulates well, so I would expect their humanoid figures (like Jet Jaguar or MMPR) will move pretty well. The tightness of the joints feels right, though I know that some of their more recent figures have suffered in this area. I believe the Toho figures are being produced in their new factory in Vietnam, so fingers crossed on that.
Paint
The paintwork on both of these guys is awesome. The metallic gold and green on Mutagen Man look great and makes me very hopeful for Supermechagodzilla, Ghidorah, and other shinier monsters to come out of the line. The UV-reactive paint on Toxie is incredibly cool, as he turns blood-red in the sun relatively quickly. This could make for some really fun variants in the Toho line(e.g., a G89 variant with UV-reactive paint that looks like Biollante puked on him when you leave him out in the sun). The paint is done well around the entire figures, which is more than can be said for some of Hasbro's figures that only look complete from the front.
Accessories
This is where these two figures go their separate ways. Toxie's accessories are done well, with grenades that clip onto his bandolier, a buddy that can peg onto his shoulder, and two weapons that he can hold fairly easily. Mutagen Man has a bunch of small accessories that he can't do anything with, and a gun that doesn't sit well in his hand. It leads me to believe that the Destoroyah crabs will be too small for any significant detail to come through, and makes me question how well the Garuda will sit on Mechagodzilla's back.
Packaging
I did want to address the packaging that these guys arrived in. Each figure arrives in a brown mailer containing a plastic bag containing the boxed figure with a slipcover. Where Hasbro has opted for environmentally-friendlier packaging, Super7 has a comedic amount of packaging. When you finally get to the window box, the figures are displayed nicely with details and bios on the package. If you plan to display your figures in the box, you won't be disappointed. The packages for the Toho figures will be undoubtedly gigantic, especially in the case of Destoroyah.