I don't have especially strong feelings about the songs on Trespass. I don't dislike any of them, but for some reason this album has always had the least impact on me of any of the proper Genesis albums.
That said, Stagnation is probably the most memorable song on here for me, and the one that stuck around longest in the band's live shows as it was incorporated into the extended jam during The Carpet Crawlers. Shocked to see it pulling votes in the first round!
I voted for Looking for Someone.