needle size

1007rl and 1205rl make close to the same size line, but which is better for general line work? #10 generally slide into the skin better, but 1205 has less needles so less trauma right?

Just wondering what people use. I've used a 7RL but want to do some finer stuff - would a 3RL give a triangular dot or would it be too small to notice? What difference would bugpins, long taper, extra tight etc all have on the dots? Thanks!