I now do both (I used to only do touching-coils in RDAs), but now I typically will use spaced coils when the deck/airflow/coil gauge makes it work optimally. I just re-built my Magma with the same resistance/coil gauge, ID, # wraps that was in it previously (and both were placed at the same height/distance from the posts), but these are spaced. Flavor is better. Of course, the resistance will be the same even if the coils are compressed or not given a specific gauge length, but spaced coils will be longer and sometimes that won't be as suitable when you can opt for the same resistance and a shorter overall length of the coils. The coils I am running right now are 26 gauge dual coil and at .6Ω, I think I am pushing the limits considering much more of the coil(s) is not over the airflow.
In my experience, assuming straight-up regular coils that are spaced or compressed, I think the nod goes to spaced for flavor. Compressed coils obviously have their place (hell, more often than not) and it really just depends on the what you are working with.
I read a post where ECF member peraspera broke down how to make spaced coils really easily using a Coil Master. Just wrap as you normally would but send two wires of the same gauge inside to be wrapped. After wrapping, just unwind one wire and you'll be left with a perfectly spaced coil. That method makes it fun to do and easy as all get out! I think his post was in reference to Ni, but obviously Kanthal will work great in that scenario (assuming 28 gauge and under).