Got a KTR1 used and I think this might be the ideal pocketable form for me. It's just about as big as it can be while still being able fit comfortably my pocket and since it's a basic slab shape it slides in much like a smartphone. The curve is enough to make it feel as ergonomic as possible short of getting a proper grip. 3:2 is perfect for GBA and comfortably close enough for many other systems.