Which Heatsink?

Hi. I am planning on buying this bad boy pretty soon: Survival Laser I 445nm Parts Bundle - Laser Components Only. I was wondering if you guys think the copper heat sink is worth it or should I just get the Aluminum? What would be the benefits if I chose the copper heat sink over the aluminum?

Thanks :na:

Copper is said to have better thermal properties, meaning you could have a slightly longer duty cycle, however, i would just go with the aluminium, its cheaper and does the job pretty well

Alrite thanks.