Tip cuttings - I've had better luck with cuttings without the terminal bud. I like to sink the cutting into the mix so the uppermost healthy bud is right at soil level.
Skinny vs. Thick cuttings (how thick?)- pencil thick or larger.
Spacing of nodes - closer together, but unless it's from one of my own trees, there is rarely a choice.
Number of nodes - the more the merrier, but I have had good success with single nodes, but prefer at least two, with three even better.
Length (maybe a factor of the preceding two) - Depends on how fresh and thick it is. About 4 inches is usually good enough, 5-6 inches is probably better - it depends on the length of the original cutting, it's health, age and thickness whether I cut it in half or not.
Cutting taken from growth of the most recent year - greenwood can work, but I prefer lignified.
Cutting that includes prior season growth- doesn't matter to me
Cutting made within the past week - I prefer fresh as possible, but have gotten refrigerated ones to work, but with a lower success rate.
Cutting washed and/or sanitized before storage - Others do, but I do that only rarely. Only when there is visible mold when I get a cutting. Sometimes that happens in the mail or with a cutting that has been stored.