I find the situations where I prefer Spear Phishing to be substantially rarer than the situations where I prefer Inside Job. Is skipping the outer ice more important than the inner ICE? Completely situational. However, Inside Job always skips a rezzed ice. In a double-unrezzed situation, Inside Job usually comes out on top. In order for SP to be better: (a) they have to commit to rezzing both ice, (b) the innermost must be more important, and © the outermost can’t be painful (because you’re facechecking it), whereas you can still jack out in-between them if you’d like with IJ. IJ might bypass just the outer ice. Or, it might bypass a bunch of unrezzed ice AND a rezzed ice.
Therefore I consider SP to be IJ 4-6, if so desired.