Yoeleo seems to be using the same shape as Far-Sports 25mm wide rim which has been spoken about already. You will find that rim profile offered by quite a few of the Chinese wheel builders. They also have the same 23mm wide rim. The more you search the more you will see these guys all have the same rims. The difference is price, the build you get, and if they have an established reputation in the west. I ordered my handlebar from Yoeleo.
Which one is more aero.....who knows until somebody tests them. I'd go with the 25mm wide cause that is what the trend is currently and the shape kind of copies the pre-firecrest zipp design aka hybrid-toroidal. the 23mm seems to just have kind of a general curved shape rather than a V.
I chose the Light-Bicycle 45mm rim cause that is a very close copy of a proven race winning design in the Zipp Firecrest 303. Nobody else seems to have it and thats exactly what i was looking for....http://www.light-bicycle.com/U-shaped-R ... tible.html
For years all these aero wheel designs were focused on a traditional NACA areo profile focusing on the leading edge of the wheel..aka where it breaks the air. Sure thats better than nothing but what about the trailing edge of the wheel? Its actually the opposite shape that you really want, its a reverse NACA profile. Zipp and Hed started to focus on this and since you can't change the shape of the tire to influence the trailing edge you have to try to manipulate the air flow and pressure by using interesting rim shapes. This is where we got the Hed and Zipp hybrid-toriodal shapes. This is why the Zipp Firecrest wheels are fatter at the spoke nipple rather than at the tire bed. They also take into account that the trailing edge of the front half of the wheel is actually the spokes so there is really not much of a need for the NACA profile. Its all about getting the air to come off the trailing edge of the tire as smooth and efficiently as possible. Its sort of a Kamtail or virtual airfoil effect. This is why Firecrest is so revolutionary and everyone is copying them.
Hope this helps.