Based on my limited experience with the Corona rendering palette (2 or 3 days worth) I actually prefer its layout compared to the typical photo rendering settings palette.
There are also a few benefits to using it that I have found so far, mainly that renders launched from the corona palette launch in the VFB, whereas using the photo rendering settings palette docks the render into an Archicad tab like normal. Unsure if there is still a way to use the VFB with the Archicad style interface currently.
Also the corona palette allows you to launch the interactive render view, whereas the photorendering settings preview seems to use different settings / take longer.
Currently it is confusing having the 2, but there are benefits to the dedicated corona palette which I hope can be carried over to the Archicad style UI.
One other thing to note is that rendering settings from the photorendering palette can be saved with a view, so you could have a view set up for preview settings and one for a final, for example.
Currently the corona palette just seems to maintain the most recent settings, which can be frustrating. Is there / will there be a way to save a render profile?
Thanks, and hope this insight helps