Using a bridge camera with a long zoom is a smart idea. What you say about general game sightings will likely prove true. Lots of elephants, giraffes, etc. in Chobe too. You likely will see lions. On a river cruise you also should see Cape Buffalo and crocodiles. However, lions may be at a distance. In a small boat you will get close to animals on the river. Things like leopards and rhinos and cheetahs in a truly wild setting can be hit or miss. Hwange may be hit or miss for lions.

If you are looking for specific things rather than a general experience, it can be challenging, however.