I was looking at the odds for matches, on Qatar wins it's over 3.5 and for Ecuador and Senegal around 2. A draw is over 3 for both games. I also think that Netherlands and Ecuador are favorites in this group, but we can't rule out some surprises, and I guess both Qatar and Senegal can make surprise us.
It is very difficult to make a comparison between Senegal and Qatar. I used to be very critical of the Qatari team (you can check my previous posts). But then I need to admit that recently they have shown a lot of improvement. Senegal is the strongest team from CAF. But then, historically the performance from the African teams have been inconsistent. Sometimes they will upset tournament favorites and the next day they will go down against weak teams by big margin. Anyway, the chances that either Qatar or Senegal will manage to defeat Netherlands/Ecuador is very slim.