I'm familiar with two simulators, FMS and Clear View. FMS has three features not mentioned for any of the others that are useful.

The model can be positioned in the top of the window so the ground is in view most of the time.
FMS has turbulence and wind gusts.
FMS will give a read out of altitude and speed which are helpful for tweaking models.

Clearview has none of these which is frustrating. What about the others?

Charlie