Unless you plan to drill paired spoke holes in your mxus flange, I vote against the Double track and in favour of Ryde Andra 40.
Main reason is that the Sun has perpendicular eyeletted holes while the Ryde has angle drilled holes optimized for larger hubs, plus no eyelets.
In any case my spoke of choice would be Sapim Strong 13/14g butted.
Use ebikes.ca spoke calculator to get the correct spoke length.