if you go strictly based upon the common opponents to date, and how both of these teams performed in those games, you'd have to give the edge here to washington.
i'm not sure that (ever) represents the whole picture though. for example, utah beat stanford at home...but lost to both UCLA and ASU at home...yet stanford beat both of them.
other than giving stanford a good game though, UW hasn't traveled well this season. that Illinois win in Chicago doesn't look that good now...and ASU boat-raced UW. (side note...regardless of tonight's outcome...the ASU/UCLA game will be much, much better. no one's gonna get boat-raced there.)
anyhow, UW's last 2 games were Cal and Colorado...so of course they're gonna look great coming into this tilt...just as most any team would have a tough time after facing stanford and oregon in back to back weeks, as both UW and UCLA have. (only UCLA had them both on the road, and didn't have an ASU waiting in the 3rd week.)
bottom line though...this game is an absolute coin flip heading into it...so whatever side you like, just try to get the best of the line and enjoy a great game.
personally speaking, I didn't see any value whatsoever with the line...so i teased the thing. to each, his own...