General

The better potential for my cannon?

So right now I just hit level 80 with my beloved Cannon Trooper <3
I have 2 Maple Gustavs (level 80 maple cannon) and They both have potential on them.

1st cannon :+3% TOTAL damage/ 3%dex/ and 15% ignore enemy defense. 95att clean

2nd cannon: 6% LUK/ 6% ATT 97att clean

Which is the better cannon? I tried testing both out on mushies in hene but i don't really see much difference surprisingly.
Thanks for the help!