What are the pros and cons of blue vs green vs orange coolant?

This is for a 91 syncro westy.  I know this has been discussed in the
past, and that it is important to use phosphate-free coolant with
distilled water.  But I'm still unclear about the colors.  Seems like
most people recommend the green coolant, but blue is maybe better
though more expensive?

Recommendations on brands much appreciated.

Thanks,
Bill
Boulder
(w/ an '01 2.5L subie engine)