+1 for why put in the work to get a diploma + degree. Once you have your degree, no one will care if you have a diploma. I guess if you really want to pursue a career that applies your degree in a technical setting... but if that's the case, you'd be better off with only the diploma, and spend that extra couple years you would have spent in school jump starting the new career.
Take my advice with a big grain of salt though. I only used my eng degree for about 3 (unhappy) years, cause I worked my ass off to get into roles where I don't have to actually apply it.