Synthesis Image Support

I can't find the info i'm looking for anywhere, so i'll ask you guys.
I am Bonecraft 102, Leathercraft 61 and Alchemy 60.
When trying a synth thats: Bone99, Leather53 and Alchemy44 (weskit synth)
Now my question is, i never know which support to get. I tryed Bonecraft and Alchemy, but just not sure which i should do.
Any info you guys have is apreciated.
THX

Just get BC. No support really matters for that b/c none will get you into the next tier. However... If you have any support for any of the crafts, you'll get to take advantage of "Artisan's Advantage" and lose less mats on breaks.