Hi,
The goal of the smart link is to promote a second offer. If you deliver other type of information, I don’t think it will distract them as they will see it only after closing the offer (having already taken of declined it), but it will bring no benefit to you either.
If it’s a second offer, then you have another chance to get a conversion.
Regarding the creative type, it’s more to give the network an idea on what type of traffic you’re using to promote the offer, so it doesn’t make a big difference. But if none is a good fit for you or you don’t know which one to choose, the raw link is always a good choice.
William