Question: is 2d6 better than 1d12?
Answer: In my experiance I find the 1d12 to be better because you tend to roll higher and lower numbers but with 2d6 your rolls are usually somewhere in the middle. You have a much better chance to roll a 12 than 2 sixes. 2d6 gets a marginally higher expected mean, and I've yet to roll a 1 for damage with 2d6.