Personally the 25mm internal/32mm external rim that appeals to me the most is the Lightbicycle WR50. Has a profile that is a bit reminiscent of HED Vanquish or ENVE's SES wheels, more teardrop shaped than elliptical or blunt-edged.
Side note, personally I think the sweet spot for 28mm tires is at 21mm internal. I think most of the wheels that test the fastest, like DT Swiss, Roval, HED, run 21mm internal. I think the lead engineer for Roval made a comment in an interview suggesting that the trend for 25int/32ext wide rims is really driven by companies selling hookless rims that need more tire volume to work at a lower pressure.