I don't have any experience with either of those, but a coupleof years ago,
I purchase a set of three purple stretchy ones. They were kinda fun, but only one was not uncomfortably tight.
In use, it was quite fun, and seemed to have provided benefits for my female partner. It became an interesting situation, when it... um... dislodged, while inserted.
I had to remove it by hand. It encircled the cervix, and was fairly difficult to grasp.
I was sooooooooo glad we know each other well.