It comes down to personal taste or belief. Some people have a preference for one material over another. I  generally use copper while some people prefer aluminium and others would use a non metallic alternative like PVC. 

Whichever material you prefer I will make your connectors to match. 

What makes our connectors so unique is that their design allow a continuity of energy to flow through copper and metallic pipe but they are non metallic themselves which make them ideal for Russian Pyramids. 

Check out my videos  " What is Phi?" and  "Giza vs Nubian vs Russian" to explain more.