I think both of them are hot, but pale blonde done right is probably more classy and professional, as long as you don't turn it yellow (or sheer white) and keep it styled nice, and don't have awful roots.
Light blondes always get called fake, but...the red is much faker!
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I prefer the blonde, though frankly I don't really like hair-dye on young women. It always look a little fake, and it's no good for your hair. Keep your hair natural, at least until you start greying.