FlyerTalk Evangelist
Join Date: Jul 2001
Location: Boston, Jo'burg, HK
Programs: AA EXP, Hyatt Lifetime Diamond, CX Gold, Mrs. Pickles travels for free
Posts: 13,161
Between CO BF and VS UC, no question, VS UC. Not even close.
In Economy, it is a toss-up. Do you have a carry on that might be OK in CO but suspect at VS (and they are very strict about it), then go CO. Waiting for your luggage at LHR/LGW can take longer than your flight.