The same weight is better.
The heat sink power should be used for aluminum and even copper heat sink, and the power supply volume is larger and better.
The cooling effect of heat sinks are usually made of comb tooth, deep, open wider, thicker, better heat dissipation effect.
Basically, it is very difficult for us to see the heat sink not open the power supply environment, so intuitive way is from the weight up decisively. Good power, as usual will increase the number of components, in order to improve the safety factor, the weight will naturally increase. It will save some poor power supply capacitor and the coil, weight is lighter.