With B1 you only can enter off of Lincoln way and exit east onto Lincoln way-
It seems with B1 being a smaller lot you could get out easier/quicker. Maybe I'm wrong. I guess you could have C1 traffic leaving too.
B1 will have ~400 or so spots once the expansion is complete. It'll wrap around to the west side of Fisher. It will also have a secondary entrance/exit from Beach, but I don't know if it'll be used on game days.