Personally, I've always preferred spaced-wrap coils. Spaced wraps are a tiny bit cooler, without all that heat all mushed up together, and I like a cool vape (I vape at 9.5w). It also allows you to check the gunking better, if you can see between the wraps. And I think with stainless, you really need spaced wraps, to prevent hotspots.
I don't really go to any great extreme though; I don't mush the wraps together, but they end up fairly close together anyway -- I think in 3 yrs of building, I've just gotten better at wrapping coils.
If you really want heat, and/or gobs of thick vapor, you're probably better off mooshing the wraps together. If you like a cooler vape, or you're not yet really expert at *just the right amount* of wicking, and/or you don't give a rip about how much vapor you do or don't produce, spaced wraps are probably better. But I think it's really just a matter of personal preference.
Andria