I have both the Baader and the GPU correctors.
On my 10" F4 Skywatcher Quattro and QSI 683, the Baader is about half way between nothing and the GPU.
Coma is still present towards the edges and it is soft accross the board with the Baader.
The GPU's only weakness is vignetting, which is fixed with flats.
I now use the Baader only for visual use.
Some light reading:
https://www.astrofotoblog.eu/?p=856
https://www.cloudynights.com/topic/5...or-compariosn/