This is a loaded question. There are a number of factors to consider when deciding which crafter item to focus on:
- Availability of mats
- Cost of mats per crafter points
- What’s your main goal? (Minimizing GP to CP ratio or is minimizing the overall cost most important?)
Due to the ranges on the different tier of crafting results I have personally found it best to do the highest set possible because your base points will be higher for doing a 95 set vs say doing the 70.
I personally did the set 90 for alchemy because mats were readily available. The NQ averaged around 61-62 and the HQ3 went up to the 130s.
The lower set numbers tend to have cheaper and more readily available mats but the NQ result will be much lower and the HQs equally lower. Set 70 tends to range around 48-50 for the NQ. So this route may cost you more GP in the end to finish.