Here are their 16-game averages (NOT including Woodson's first year, when he was just a backup) --
INTERCEPTIONS
Williams 2.77, Woodson 2.27
SACKS
Williams 1.69, Woodson 1.09
TACKLES FOR LOSS
Williams 5.54, Woodson 4.74
QB PRESSURES
Williams 5.23, Woodson 3.65
PASSES DEFENDED
Woodson 8.99, Williams 8.62
FORCED FUMBLES
Williams 2.77, Woodson 1.48
FUMBLES RECOVERED
Williams 1.23, Woodson 0.99
TOUCHDOWNS SCORED
Williams 0.62, Woodson 0.20
Roy has a big advantage in almost every category. Woodson has the advantage in only one category, and just barely, at that.