Out of the two guys who never did shit as pros I would pick Briggs. Biggs was Audley Harrison with some guts: plenty of physical talent and nothing else. Briggs at least made some kind of career as a heavyweight, hanging around behind the elite for quite some time. Biggs might be able to outbox Briggs for a while but eventually he would be bombed out. Seriously, the only thing Biggs ever did was to do well for two minutes against Tyson
I'd go with a "prime" Briggs (whatever that means)...but a Biggs win wouldn't surprise me either. It's a close competitive affair.