heater core questions

[treads]

My heater core stared to leak end of last summer. I have now installed a new alum rad and was looking at wildhores and saw a alum heater core. So my question is will it make a differance if i run a copper heater core or a alum heater core? they cost the same and im going to run a anoid in my rad cap to help keep the alum rad in good shape. Thanks for your help.