Copper heatsink
[PRO]
- good at absorbing heat
- can hold massive amount of thermal energy
[CONS]
- bad at heat dissipation compare to aluminium
- need a good fan to remove heat, the better the air pressure, the better the dissipation is (contribute to noise)
- heavy

Aluminium heatsink
[PRO]
- light
- good at heat dissipation
- suitable for passive cooling that does not involve too much heat
[CONS]
- less effective at absorbing heat compare to copper
- needs bigger size to store more thermal energy