Time Profile: Time dimension at week level vs at month level with weeks in UD

Hi All,

I am designing a new app with huge data set at detailed level and need time at weeks level. I would like to know if going by custom profile with time dimension at weeks level would be more efficient or having time dimension at month level and using WEEKS in User defined dimension would be better in the performance.

It would be great if you can share some pros and cons for both the approaches and which one would be optimistic.

Thanks in advance.