for start I suggest the following links:
The two products have a common engine, so I think both are pretty good
the development in QlikSense is more faster, but there is no many customisation option like in QlikView.
I think you should see product demos in both environment:
Sense demos: Qlik Sense
Mashups(?) for sense: https://demos.qlik.com/qliksense
QlikView demos: https://demos.qlik.com/qlikview