But in some cases the web site won't render the same from tablet to tablet or browser to browser so the app gives the company a more controlled presentation. That is, if the tablet's browser is not as good as say Chrome, then you may not get the full experience you would on the app.

Also, the company's site must cater to the lowest common denominator browser so again, it usually isn't as rich as the app.

And again, your choice.
Bob