Obviously a very hard question to answer, since Liam kicked out one kick-ass track after another, during early and mid-90's (especially ; ).
But from the 'Always Outnumbered Never Outgunned'-era, for me it's definitely the "More Girls" track from the Girls-single.
That tune provides some clinical Raw Exploding Energetic Beats ..almost too good to be true! It bangs the hell out of ya head loosin ya body to that track. The way he handles the beats in that one, makes me see a light at the end of the tunnel.