I cite you here a answer from Georgi from Telerik:
Quote:
Both technologies (C#/XAML & HTML) perform close regarding UI responsiveness and performance. There are some slight differences but from our experience, making components for each platform, we may say that the differences are insignificant. With that said, it is up to you and your skills to choose the platform that you feel more comfortable with.
So if your choice is between WPF and HTML (and as noted both these options are second grade) than you should choose according your knowledge...
What may make HTML a favorite is that there are several 3D (JavaScript) engines that may help you start faster (I do not know a WPF specific engine of 3D)...