I'd drive and park... BUT.... the only reason I would do that is because I'm in no hurry after games to get outta Dodge. I'm perfectly fine biding my time.
If I had need to get out quickly then it all changes... I have no familiarity with public transit in LA, (never having used it), but it HAS to be quicker than driving out... which is hell. The Coliseum area is NOT made for mass traffic.... UNLESS... there are secret routes, tips, that other's more familiar with the games there may be aware of that I do not. - JamesJM