well, the thing is, the windsor head has 3 12ax7's, but one of those would be the phase inverter, presumably... so i'm guessing it could have the same amount of gain as the head. though from what i hear it's a bit more vintage-voiced. it's virtually impossible to tell how much gain it'll have from the number of tubes, of course, as the circuit will affect things too...
EDIT: i assume the laney is push-pull too, so in that case one of those 12ax7's would also be the PI. so i wouldn't necessarily say the laney has "more" pre-amp gain.
also, i liked that hammerhead when i tried it. a bit noisy, but if you already have a cab (and noise suppressor), that's a good deal. would be worth waiting to try the windsor first, though.