Curvature...I have experienced both and the RACWA suited me better. Ad-Astral also provide excellent training, but it's interesting that the Royal comes in cheaper. Not so long ago Ad-Astral were the cheapest around.
As you probably know, the training at the RACWA is done in a seperate building. It's good to be partly removed from the chaos of the main operation. Brad is an excellent instructor, and the Seminole and Partnavia are good IFR platforms, (as is Ad-Astrals Duchess).
I preferred RACWA's Frasca 142 sim over the two that Ad-Astral use. They are good for building strong legs during assymetric training though.
One advantage that Ad-Astral has at the moment is that the flight test is done in-house by Ron. I'm not sure that RACWA have a testing officer yet.
PM me if you require more info.