Lb -> 2h?

If you have the fundings, are a Hero and Time leap is available, a perfect Dragon Carabella would outdamage a perfect LB and a perfect Shield combination!

I think you ment Speed Infusion, and not Time Leap right?

And you can't choose any Carabella, it would have to be at least a 109 att clean one.

And even in that case, it wouldn't be better, they would be the same, because they will both have 144 att, the only difference is that if you are using carabella, you would need an extra party member (buccaneer), just to give you speed infusion. If you don't have him, Lunchbox is still better.

It would be better if it was a 110 att clean carabella, but i'm not sure if those exist, but then again you still have the problem of an extra party member.