what 't the difference of the hsim and nanosim?

[tuza2000]

hsim nanosim difference

i hear about that hsim and nanosim is good for mixed signal circuit simulation,but what 's the difference of them?
i am designing a flash adc i want to do post simulation,i dont to know which to select.

 

[edafisher]

hsim vs. nanosim

Both are very good simulator. But now Hsim seems to gain more popularity in industry.