Larger one, bank and tap knobs are slightly more convenient.
I just hope it gets released soon, I'm controlling it with a TC novasystem at the moment, on which I only have 3 presets per bank available, and I can only switch between presets, and not turn any effects on or off with it. I'd go for a larger midi footcontroller, but since you guys are developing a controller specifically for the KPA, I guess I'll just hold my breath a little longer 