Mining vs. Farming?

[Googi]

Today I was farming (Mostly so I could have food when the potatoes weren't feeling generous.)

Anyways, after getting my bread, I noticed that for three bread (I had a lot of bread, so if my calculation here is somewhat off, forgive me). You would get 1 platinum, 4 silver.

Of course, since you can grow A LOT more then 3 corn at once, the payoff is of course a lot more.

However, there is also the problem of a PKer showing up (Although that happens in mines to), or someone to steal your corn.

So, mining or farming?