I have both the BP and Fatshark Attitude V2 goggles. I use the goggles more often than my monitor as that is my preference for the following reasons:
1. No glare with goggles. Even with the sunshade, you still have to deal with some glare on the monitor.
2. The total immersion of goggles gives me better control, or at least that has been my experience.
3. For me the monitor can be distracting. What I mean is that with the monitor, you're not stuck in first person and I'll wander watching my Phantom in third person. The change in perspective affects the way I can control my Phantom.
One more thing I wanted to add, the monitor is 720 so it produces a better looking picture than goggles. The image still isn't HD, but it does look clearer than through my goggles.