Depends.........what year model are you interested in?
Probably the Vic, as they have been making them RWD for EVER, and the bugs are all worked out. The Roadmasters are FWD these days, and a LOT of people are still plenty upset that GM doesn't make any more RWD barges.
P.S.
If the RM is RWD, it would be MY choice, but I have always preferred GM vehicles over Fords until NOW. I like those hot new 'Stangs (the QUICK ones).