I was looking at the specifications of them last night and they are near identical. Differences I saw are the cone area, RMS (600 JL vs 1000 SQL), Sensitivity (87.6 JL vs 92 SQL), and weight (17.75 lbs JL vs 26 lbs SQL). With that in mind plus the ratings I have read, I believe the SQL will edge out the W3.
I think a better comparison to the SQL would be the 12w6v3.