As I mentioned it depends on how you are using the registrations, for some the Ketron way is sufficient but for me its simply not.

Let me give you an example of how you can use registrations on Yamaha keyboards, which is not possible on Ketron keyboards.
On the Yamaha you have a registration bank or “block” which consists of eight single registrations. This is basically the same on the Audya except a registration block on the Audya can actually contain twenty single registrations instead of only eight.
The big difference is what you can actually save in these single registrations. On the Yamaha you can save EVERYTHING eg. fill ins, breaks, intro, endings.
What this means is you can have one complete performance (one title) using those eight regs. Lets say I have a verse in the song using variation B with piano in the right hand and now I want a break and then play a solo using variation D with guitar in the right hand and strings in the lower part; on Yamaha no problem: I can save this change in my registration and only need to press ONE button. On the Audya this is not possible, I would have to press about 5 buttons at the exact same time while still playing.
This is not flexible at all.