Assuming nicer appearance, most will prefer the natural looks.
I've got the purple harlies. Only a few left, but I do like them. But the original red coloration is very nice. They don't really age nice though, they tend to fade to a dingy color.
Mine when they were at their prime
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I'm actually thinking of getting a mix of reds and purples now. Maybe a couple blacks if I can find them.Oh, I mean appearance. Just my opinion; get the purples if they make you happy. I'm sure their behavior is about the same.