Hi Jenny. You’ve been puzzling about this question for a month. Your paralysis before selecting a system for the long haul is understandable. The best thing for you is to use the remainder of the time that you would have spent wavering to begin building this:
The system takes a lot longer to build if you aren’t building it. That’s the trick: don’t not build it.
Credit to Jan, but the significant advantages that the shadow system affords extend through almost every discipline and are decisive. Go, go, go!