Should I buy new or used diesel?

So I made a mistake by buying a new Ford focus st and now I want to get rid of it for a truck, I'm taking a big loss but I've accepted it.

I want to get a diesel and a boat.

I have found 2 options I like:
2006 2500 cummins with 98k miles in good shape for 28k

OR

2016 Ram 2500 Cummins for 43k new

The 06 is cheaper but 10 years old. Would it be worth it in the long run to just get the new?

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