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Bear in mind I'm no expert here, this is just what I've found.
I used 2% Thoriated (Red) for steel and stainless and sharpen them to a needle point. They seem to give good results.
On Aluminium I used to use Zirconated (White). You use the plain electrode on a bit of scrap before you start and it will form a ball on the end. They worked OK.
More recently I've switched to Ceriated (Grey) for Aluminium. I sharpen them to a pencil point, a bit flattened on the end. I find they give a more concentrated arc that is easier to control.
Cheers
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Mike Murphy
Melbourne Australia
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