I haven't tried both but I have the Stockholm P-90 soapbar bridge pickup and the alnico Warpig humbucker set.
Comparing those I'd say that the Stockholm has more of a hardcore punk tone than the Warpig, and is in some ways similar to my alnico Nailbomb bridge in terms of EQ but with slightly smoother mids. More aggressive than the Miracle Man bridge (which I also have).