Personal preference for long coil life and flavor, X4. For a slightly less restrictive vape, good flavor, and moderate coil life, T8. For long coil life, a little higher wattage and clouds, moderate flavor, T6.
The Smok coils seem to last longer if used lower in the recommended ranges. X4 at 45-50w is where I liked to be. The wattage range and resistance don't always predict the vape, so you might try them all.
I get tired of any given setup quickly and rotate to something else. But I was the same with the analogs, enjoyed switching it up. Now if I can only find a coil I like for the cloud beast.....