Gunman, hands down.
But also Your Love, with Ricky Tuffy (both versions) - nice memories when it hit hard in the dances! Also from same era, another sound system boom tune : Hypocrites w/ Daddy Freddy.
More recently :
http://www.youtube.com/watch?v=hH8PEaDPNZQTill the end, his voice remained intact, amazing!
His "Consciousness" LP produced by Yabby You is chock full of wonderful tunes.
One of the few artists who did justice to the Heptones' originals when he covered one (thinking of Fighting to the Top!).
A great but underated giant !