Turrets are generally the better choice.
The biggest issue with a dome is that domes are not recommended outside unless it is well protected from the elements. The big issue is that the domes will hold onto water droplets much longer than other cameras and thus any dirt on it can then become problematic. And during a rain event with IR, the camera is basically blind...but even without rain, the reflections of lights even outside the field of view can throw weird reflections into the dome.
The domes attract lots of dust. Then rain. Then dirty rain spots. Glare from all angles of the sun. Then over time the sun will "fog" the dome like a car headlight.
We have more people coming here posting a problem picture at night thinking there is a problem with their dome camera when in reality it is the IR bounce from some object that the dome is then capturing and magnifying.
You can still get IR bounce with a turret as well as this
thread shows , but they are usually easier to mitigate than a dome.
Doesn't mean a dome won't work, but turret usually results in the better overall performance, plus not many domes are on the ideal MP/sensor ratio.
