It probably more depends on what you're looking for in a nib. Gold nibs typically have some kind of bounce to them. The Viper is a hooded steel nib so it'll probably be a much more stiff writing experience. But I've heard Diplomat nibs are pretty smooth writers. In my experience, Sailor nibs have some feedback and can "sing" on the page.
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Thanks for the info. I opted for the Sailor and have been using it as my primary writer for a week now. I must say that it is a very different writing experience than my TWSBI Diamond (F) and the Schmidt #5s on my YStudio Brassing and TC pens. It really feels like I’m writing with a mechanical pencil. I enjoy it. I now have the Diplomat Viper in blue on back order.
For a moment there I thought the Viper was a capless! That would have been awesome. Still a nice looking pen though.
My experience of Sailor is that they make plasticy pens, but with very nice nibs. The Viper looks more substantial, but I've never used a Diplomat before.
I've never used a gold nib either.
One thing worth taking into account is that the Diplomat will be a much heavier pen than the Sailor. Whether that's a good or a bad thing will come down to your preferences, but searching around reveals the body of the Diplomat weighs 21g alone, versus 10g for the Sailor.