Hi Donny,
When you can get away with it use carbalt but the more narrow of V graver angle you make (fragile of point) the chance the carbalt point will break increases. If the point is breaking first dub the point slightly and see if that helps but if the point is still breaking go with the M42. The carbalt will hold an edge longer than M42 but it is more fragile than M42 or HSS.
Here is a chart showing pros and cons of each.