Uh, both?
Mostly spaced because I usually space out... I like the fast action (which can be important at low power, I'm usually a 8.5 watts) of finer wire, so use 30. I'm not fond of the coil taking a bit to actually work, and then taking that same time to cool down, the "waste" heat carmelizing the juice all the while.
Compressed will last longer with rayon, since there's less chance of distorting it when wicking. Heavier gauge, I'd "recommend" spaced, more wire to wick contact area. And it's rigid enough to minimize the chance of being messed up. Lots of folk use 28 for that reason. But even with 30 the coil (if careful) will last many rewicks.
But, as with many things in vape, best to take any recommendations as merely a starting point for your experimentation, to find what works best for you.