Observations

1. The total length of blocks off the main DAG grows quadratically, with GHOST growing faster than MaxPC (this is what I'm going to call the PoW-style fork-choice from now on in order to prevent confusion with actual proof-of-work).
2. The total number of heads of the DAG grows linearly, with MaxPC growing faster than GHOST.

Evidence

1. Data and plots given below. GHOST in black and MaxPC in red.