Generator Configuration 1

I have a 12kw military genset. The engine and generator have been rebuilt. The output selector switch has been wet and has a problem. It is a 220 volt 12 lead generator so I can hard wire it any way I wish. As I am only interested in single phase I plan to eliminate the selector switch. My question is whether to use the ‘Z’ or double-delta configuration. Any pro’s or con’s to either method?

Thanks,

Fred Schroeder