I disagree. I have an synthweaver/arch/UT and a armormech/slicer/scavenger and in my experience, arch has more nodes than scav.
Hunh. I wonder if I just have the good archaeology regions then. I know some good scav spots on almost all planets, but for arch I've been unable to find anything approaching the same density after Taris (Republic, so it's the first planet after capital). Maybe I should make a comprehensive map of all the nodes I can find and compare the types.