It depends on the turn. With training you can do gentle turns (std rate, 15° bank) with the artificial horizon, turn coordinator, and watching the compass. When

It depends on the turn. With training you can do gentle turns (std rate, 15° bank) with the artificial horizon, turn coordinator, and watching the compass. When doing standard rate turns I watch the nose on the horizon, the turn coordinator, the compass, and the vertical airspeed indicator. Once you get into 45° and 60° banks the forces are disorienting and it's far easier to look out the window at the ground and the real horizon. Training or not, it's far easier to look out the window to make turns. You can see if the horizon is starting to move. If you sit there and watch the compass you can easily enter a stall or a dive without realizing it. Especially since your turns are not going to be coordinated (you won't be using the rudder effectively so the forces on your head will not be what you're used to).