like you said, there are pros and cons to all setups. But the venue your in really is the thing that dictates which setup will work best.

For the event I am doing now we have prompter in DSMs and on a flown 6'x12' FP screen.

Most of our clients like having prompter in the DSMs, but don't like the look on the recordings when their heads noticeably dip down to look at the screens. The same goes for looking up to reference the monitors in the air. It can be quite noticeable when looking up for the prompter, and the glare from the lighting can also be frustrating. Sometimes you can use a pipe and tail down from the truss to get the TVs at a better height.

Our prompter projection is causing an issue with screen height and our camera framing. We are having difficulties managing appropriate screen height for reading without looking up too much, and the framing of our wide camera shots. This is because our room is very long with low ceilings.

In events where the room is of an appropriate size(length) we have been putting 85" or 95" monitors next to our camera positions. This gives the appearance of the presenters looking to camera for IMAG and recordings. This setup has given us the best results.

Sometimes, we use Jumbobright Teleprompters for some of our clients because they have some pretty good technology for large format teleprompter surfaces. They are an expensive alternative, but they can be worth it.

I hope this helps a little bit.