[boost] std vs boost

When I'm writing library or user code, I often reach for a library component. Often, the similar/equivalent component exists in both the standard library component and the comparable boost component. I'm never confident about which to choose. Ideally I'd like a simple rule like "if you can choose between two components - prefer the standard library one (or Boost one) because ...". Is it possible to craft such a rule? My main criteria is mainly stability - once I've got something working I hate to be surprised when some "upgrade" breaks my code. Or is no longer supported. In other words, I don't want (and cannot) baby sit the application/library forever. Anyone have thoughts on this? Robert Ramey