Hmm...from my least favorite to most:
Candyroy: I do like the concept, here. A candy wrapper come to life. That's maybe the most creative concept in this list. The problem is, I just don't care for this design. If this was one form of many, like Hedorah, I'd probably like it better. But, assuming we only get one form and one suit, this ain't it. Personally, I'd kind of like to see a more colorful and in-your-face take on this concept in the future. Really play into the idea of living candy.
Sagius: This is just a bulkier version of Mecha Godzilla. And I love Mecha Godzilla. But, this just feels a little too big and awkward for my liking. It looks like a rejected concept from the Planet of the Monsters trilogy.
Gilx: This sounds like a amped up version of Space Godzilla. And the description makes it sound like one of the most powerful monsters ever, able to destroy planets. Which SOUNDS like it'd make for a interesting fight. Although, I don't know how any "normal" version of Godzilla would stand a chance against it. But, design-wise, it just feels a little generic, to me. I feel like it needs...a little something more to make it more memorable, design-wise.
Minacius: This is another one where I REALLY like the concept, but not so much the actual design. A giant robot "kirin" from a ancient civilization is a REALLY cool concept for a new kaiju. But, this design just doesn't do it for me. The face is a little too "ugly" in a bad way, and I don't care for the "magnet hooves". I really wish they would have leaned more into a "ancient statue" aesthetic.
Rigedoh: I like the look of this thing. The glowing horns has the potential to look cool in live action. I could take or leave the gigantic arms. It kind of looks like a original kaiju from a video game, or something. But, it just isn't that interesting story-wise.
Gigasecto: You know what, I have to appreciate them trying to add another bug kaiju. And this one looks good. I like the big horns and the reddish hue. The problem is...it's just a big bug. It's not very interesting, story wise.
Madomuh: This is Cthulhu. You just stole Cthulhu and turned him into a kaiju. And while Godzilla fighting Cthulhu WOULD be really cool to watch...I can't reward such blatant theft.
Xenolhu: My personal favorite, and the one I voted for. It still feels pretty Cthulhu-inspired, but I think this one seems more original. I like the pop of color with the underside being purple. And the head looks suitably sinister for a Godzilla villain. Plus, some of it's powers seem pretty unique. Like being able to warp reality around it, and being able to hypnotize it's opponents to some capacity.