Definitely option A. If you've never been to Vegas during fight weekend, the leadup alone is a spectacle. All the people (Mexicans will be out in droves), playful banter, the excitement of the weighin, etc. It's like nothing else IMO. Been down there twice but have always done the closed circuit at Mandalay Bay for $50. Still exciting as hell. When Pacquiao got KO'ed in December, the Mandalay Bay events center erupted. My jaw dropped and I was speechless for awhile.
Plus this is the biggest fight in years (not most competitive as I think Mayweather whoops Canelos ass but it could possibly get close or even break May-DLH's numbers)