Just got WW

Hey guys, just received my WW block today and in the packet it came with a little tube of arctic alumina. I already have arctic silver, which is better to use or does it matter. Ive been very happy with the performance of the silver and am leaning toward continuing using that. Whats everyones opinion and anyone who has tried both please share your experience.

Thanks
Shane

Artic Silver should perform better than alumina