Broad Sword
Maximum HP: +2 ~ +5
Maximum Stamina: +2 ~ +5
Strength: +1 ~ +14
Dex: -10 ~ -22
Luck: +4 ~ +20
That's from the wiki for Artisan upgrade.
The final normal upgrade that you can get is +5 max and +5 crit, so in all ways not getting the Artisan is the best idea ._.
(unless of course you prefer ~.6 more maximum damage at the max roll of str, while still lacking in crit)