Unless this is something you really, really want, I'd suggest: Neither.
It's not a simple install either way, as you have to break out the old dummy light, you'll never get to see it in action, and it will either annoy or go unnoticed by most drivers behind you.
It may be the single most pointless mod for the Z, even topping the GT-R start button, which by contrast is super-easy to install, inexpensive, risks annoying no one, and you at least get to see it all the time.
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Enjoy it. Destroy it.
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