title: QTreeView or QTreeWidget
body: <p>I want to implement in my program a tree with nested sub-levels, and I'm looking for which of those two kind(View/Widget) is best suited for my goal.</p>
  
  <p>I have a list of days with task that are either done/missed/failed, each task has a count of how many times it was done/missed/failed and lastly a score for that day.</p>
  
  <p>I want to display them like so:</p>
  
  <p><img src="https://i.stack.imgur.com/lHwx1.png" alt="tree display"></p>
  
  <p>I made this example in QtCreator using a QTreeWidget, but I'm worried that it would be hard to modify the elements since they are stored somewhere else.</p>
  
  <p>Are my worries rational and should I go to the model/view structure, or can I easily get going with the QTreeWidget? The tree will be logging the task and thus will be constantly changing. Elements will only be added to it, not removed. And the days will be sorted from highest-lowest(day 2 is first, then day 1)</p>