The Goal vs System approach work for two distinct types of people. If you generlaly like laid back, passive work (ex. stable job with a a few nice sideprojects, worksout everyday, has a nice rythmic life), then the System approach is for you. You're already pretty content with your life, and everything you do should work toward maximizing stability and hapiness.
The goal approach is different. If you're a frequent procrstinator; if you have brief bursts of productivity followed by long lulls of laziness; then goal is for you. Goal forces you to deal with situations that you'd rather procrastinate, essentially keeping your energy in check.
For most entrepreneur, I'd imagine the second approach would work better.