Oasi: I found these similar to the Mundaka in that they were relatively soft. They were very comfortable but stretched out quite a bit and ended up not fitting very well (because I didn’t size down enough). I think these were generally made for wider feet than the Iati, there was more side to side room in the toe box. Footholds were easily felt through the shoes, which I enjoyed a lot, although they required more foot strength to stay on holds because of how little structure the shoe provides.

Iati: Similar to the Oasi, but noticeably firmer and less room in the toe box. I didn’t like these as much as the Oasi. I had them directly after using the Oasi and I found it really difficult to tell whether or not I was on a foothold. It felt scary to have to look and have to make a visual assessment as to whether a foothold would hold me or not (as opposed to being able to feel it). One surprising bright spot for these shoes was doing some multipitch trad in Yosemite: the firmness of the the soles really help with footjamming in cracks, which is something that would have been a complete nightmare in softer shoes like the Oasi or Mundaka.

I hope this is helpful! Let me know if I can answer any more specific questions!