Which protein fold is more complex?

Each chain is coloured N-terminus (blue) → C-terminus (red). Drag to rotate, pinch/scroll to zoom, or tap a structure to enlarge it. Then choose the more complex fold — or flag one as "not a fold".

STRUCTURE A tap to enlarge · drag rotate NC
STRUCTURE B tap to enlarge · drag rotate NC
Why is it more complex? (optional — pick any that apply)
Extra comments (optional)