I think whatever wire, closed gives much better flavour.
There are too many variables to say that definitively. The atty can also dictate where a spaced coil will work better. I personally get a better vape and flavor when spacing in most of my set ups. I also use some Aliens that vape better not spaced.I think whatever wire, closed gives much better flavour.
*scribbles out a name tag sticker for you it reads "Coil Whisperer"*I let the coil tell me what it wants.
I find the difference minimal a lot of the time. I will do either depending on the deck I am working on. If it has a lot of distance between post holes, it is going to be spaced. If room is tight, it will be a contact coil. If either will fit the deck properly, I go with a spaced coil since they are a lot easier to get firing evenly since I don't have to poke and prod the coil to get hot spots out.