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I've been rebuilding a couple of months now and I've lost my way    maybe it's too much information or conflicting information or maybe I'm just thick.

I'm sort of hoping one of the experts (not naming names) will pick this up and produce a "sticky" as I can't find a single source of reference... 

I use Steam Engine and by playing around with numbers I can make a (for example) 1.5Ohm coil using an almost limitless combination of Kanthal / wraps / internal diameter

.28 9.5 wraps at 2mm
.28 8 wraps at 2.5mm
.26 14.5 wraps at 2mm
.26 12 wraps at 2.5mm

etc...

So the Ohms calculation is a correlation between length of wire and thickness (resistance) of wire.

My question is then, which is better (and why)... lots of wraps with a smaller internal diameter or less wraps with a larger one?

Bonus question 1 - What is the effect of spaced (non touching, as wound on a bolt thread) vs touching (heat / tweezer method to heat from inside out) ?
Bonus question 2 - Different wicking materials can be used (organic cotton, muji, bacon, silica etc)... apart from personal preference, what are the different characteristics?
Bonus question 3 - With the advent of TC - can we have similar responses to the questions using Nickel instead of Kanthal? (I accept you can't / shouldn't make a 1.5Ohm coil in Nickel but the comparison still stands)

I've started so I'll finish....

This is the noobie question (shows how confused I've got with this) - Given a choice of 1.5Ohm, 1.8Ohm and 2.0Ohm prebuilt coils for my Nautilus, what would I need to consider to decide which one to use? And, "if" I couldn't see the Ohms rating via the screen / on the coil, how would I be able to tell the difference (blind taste test scenario)?

I've deliberately left sub-ohming out of this as it's a different genre and I suspect those into sub-ohming know all the above already.