Which is better fungicide: copper or sulfur?

[greenleaf]

Which type of fungicide is better for orchids, copper-based or sulfur-based? I just bought both of them from Home depot, one contains sulfur while the other contains copper. I know physan is better but I need to wait 1 week or more before it arrives thru the mail. But my cymbidium has been developing lots of (probably) fungal leaf spots and brown leaf tips. I also have a cattleya that has some root rot and could use treatment. I am just afraid that the fungicides will hurt the orchids in any way...

Thanks!