The only ones I like are the original Roleez, that have four soft-rubber wheels, two on the inside of the hulls and two on the outside.
But they don't seem to make them that way any more. Now the Cateez seem to have just two wheels, on the outsides of the hulls.
But at least I like the wheels on the OUTSIDE of the hulls because when I am singlehanding, it is easier for me to keep going from side to side and kicking the wheels back farther until they get where they need to be.
Harder to do that (at least for me) when the wheels are on the inside of the hulls.
I'm not an engineer, but it must be something to do with leverage and bare feet.
I can do the same thing with the other beach wheels, but it just takes longer, and more effort.
And none of them work very well when the tires are flat, which seems to happen a lot with all of them.

Maybe it is because of me kicking them too much.