Brake cam difference/effect

I know that GP brake cams are thinner and the brake shoes are longer to compensate.
My question is are they more effective than the older style ones? Do they push the shoes more for the same travel in the pedal or is there no difference?
If not why did they change them?
If so I'm changing the one on my series 1 cos it's merely adequate.
My question is are they more effective than the older style ones? Do they push the shoes more for the same travel in the pedal or is there no difference?
If not why did they change them?
If so I'm changing the one on my series 1 cos it's merely adequate.