I partly agree with you, but I would say that the main difference between the two shows is that the Swedish Wallander is a decent crime show, like Taggart or Frost, with the added novelty of a Swedish setting, while the Branagh version is an attempt at something more "arty".
How well they succeed in their aims is a matter of opinion. I preferred the first series of SW, but still find the second series watchable.
Some people will always prefer a good cop show like Swedish Wallander to the arty, you could say pretentious, sort of stuff that Kenneth Branagh comes up with.