!Gulp! Quick run! oh no here they come aaaahhhhhhh.
Just kidding. I am sure that you will get a ton of responses.
12V to me anyways = quieter , less expensive in SOME respects to get power out of , Many things mechanical = easier and less replacements , Sound , and hey it's a cummins.
24V to me anyways = louder , can be more expensive to get power out of because they respond well to electronic enhancements which in turn turns attention twards drivetrain sooner , many things electronic which in turns makes for easier shade tree diagnostics , however sometimes more expensive repairs , better "Economy" , power is switch on / offable.