title: Tuple<List<int>, List<int>> or a List<Tuple<int, int>>?
body: <p>Which is preferred and/or more efficient operation wise?</p>
  
  <p>I ended up using a list of tuples, but am curious as to which one is preferred.</p>
  
  <p>Opinions welcome but I would love a technical aspect I'm not finding via google.</p>