never heard of it but probably sub
Both are fine. U_U
U may feel it a bit boring in the initial ten episodes, but keep on watching. It keeps on getting interesting. U_U
There is a saying : Always go with the subbed version.
In this case, you won't regret it.
I watched it dubbed first and I thought it was really good. My uni screened the first two episodes in subbed today and I thought it was really good too. I guess try both and see what you like?