No exposed o ring on ultima, plastic won’t get bent, you can use without wrist seals (you do need part of the seal but can just be the minimum) they are not cheap but still a lot cheaper than KUBI.
I did specify "when the gloves are not attached."
When you're not wearing gloves, the Ultima wrist rings that are on the end of the sleeves have both an exposed O-ring and the mating surface (the part the glove ring attaches to) is also exposed. Right?
In contrast, when you are not wearing the gloves, the Kubi ring that is on the end of the sleeve has no exposed O-ring, and the mating surface that mates to the glove's ring/O-ring is on the inside of the ring.
That is one of the reasons I cited for my preference of Kubi. When you dive without dry gloves, the parts of the dry glove system that you are diving with (the bits attached to the end of the sleeve) have less opportunity to get damaged - because the parts involved in sealing with the dry glove rings are "in" instead of "out".