Fairly common question, and I can give a completely biased answer since I'm the developer or just state that it's really personal preference.
I've answered in another thread, that yes, our base price is more expensive, however it has been reduced recently. However, as we add new major features we won't market them as a new product that you have to pay for. Invision offers a gallery addon, but you have to pay extra for it. We'll be adding blogs in our next version after 7.3 and this will be included in the base price, unlike vbulletin which charges extra for it.
It's a pretty common statement that our Control Panel is easier to use. However, again that's more than likely a personal preference and you're free to sign up for a demo so you can see for yourself.
