I've played both approaches, fow and deafening silence. Silence seems better against combo, but having fow increases by a lot our blue matchup. Played the playoffs with BUG survival and got 4-2 (9th place -.-) , fow helped a lot more than FoV would have.
Seems like there are less combo out there and I don't think it's worth playing white for it. 4 Leovolds between maindeck and sb seemed pretty good too. Too much blue out there, and with fow leo is a house.
What are you commonly FoWing against fair blue / xerox? What are you pitching? Deafening Silence crimps Xerox pretty badly as well they can't chain cantrips. And fast Thalia is a beating against Xerox.