Many good reasons for picking A, but one for not picking B is that it is easily defended? I don't think you can defend the B as defined.
Playbook of B-'bot:
- shakes off its two balls in hybrid so others can pick them up
- Post (or possibly autonomously) hybrid it goes to alliance bridge,
- pulls back the balls there,
- balances on it,
- waits for possible alliance traffic from own side by already tilting that way,
- scoots in front of alliance 'bot wishing to cross to other side,
- hovers in the lane (avoids contact with opponents that way or scores big time if they foul him),
- back on the bridge and tilt to assist returning alliance member,
- scoot in front of returner,
- back onto bridge to await triple balance in end-game.
I don't have one of these machines, but if I did, the opponents would never touch me. It
would be slightly larger than 15x15 though.