It really depends on what you want to do with your craft.
From personal experience, I have Goldsmithing, Blacksmithing, Weaver, and Armorer at level 10.
Goldsmithing at level 10 gives Epiphany and according to the Database, it says "Increases chances for improved craftsmanship of next synthesis. Most effective for parts." which I'm a little confused on as to what exactly is improved in my craftmanship.
Blacksmithing at level 10 gives Maker's Muse which, again, according to the Database "Temporarily increases rate of success for standard syntheses. Most effective for mass production." I find this ability somewhat useful when I just want to skill up off raw materials. And the best Successful Standard Synthesis gives Progress and Quality with no Durability Loss.
Weaver at level 10 gives Masterpiece which, again, according to the Database "Temporarily increases rate of success for bold syntheses. Most effective for mass production" Bold Synthesis is inherently risky as the penalty for failure is harsh with no Progress or Quality gain and heavy Durability Loss. But Where I do find this ability useful is when I'm doing Crafting Leves. When I meet the minimum requirement for the Crafting Leve, I then use the left over attempts to focus on upping the Quality of my products to raise my appraisel rating to 100+. Having an appraisel rating that high yields more Gil and sometimes extra items as rewards!
Armorer at level 10 gives Blinding Speed, "Temporarily increases rate of success for rapid syntheses. Most effective for mass production." I only find this useful if I'm running low on Durability and I need to finish the craft, well, in a hurry.
The other level 10 crafting abilities sound good too, even though I haven't had a chance to test them out. But here's my 2 cents worth. Happy Crafting.
Consciousness - That annoying time between naps.