JR 137
Grandmaster
As a larger person, taking them to the ground and pinning/choking/locking them is always an option.
That's an option for a larger, smaller, or equal sized person. But everything has its time and place. In a parking lot, alley, or anywhere else that you're reasonably sure there won't be outside help from his buddies, have at it. In the middle of a bar, outside the bar, or anywhere else where there's a crowd, not very wise. I've seen more than enough kicks to the face/head and bottles to the back of the head of ground fighters.
Yes, while standing, you absolutely have the risk of being attacked from behind you from his friends. But at least you're not a sitting duck and can get away quicker. Engaging in a jujitsu match in where there's a good chance of outside interference is suicide IMO.