Did I choose correctly?

[Niwashi]

Hmmm, the 29 has bonus of:
Int 3
Det 2
Acc 3
Spell Speed 2

This one's designed for Disciple of Magic damage dealers, like Black Mage.

The 40:
str 4
dex 4
skill speed 4

This one's designed for Disciple of War damage dealers.

Favor the one suited for your class over a higher-level one suited for different classes. If you plan on diversifying and picking up those other jobs, you could hold on to the DoW one for that, but otherwise it isn't very useful to you.