flying rigs –
Netherworld introduced me to the flying actor rig. I helped install an "I" beam that used a trolley and chain. The actor just hung with a harness and flew from one end to another. At the time, about 6 years ago, this was safe and effective. Since then I have seen actors fly on thick cables stretched from one wall to another. Please don't do that unless you know your cables, and even then, there are better ways. I strung up an actor using a barn door track. Video below. This worked well and inspired other haunters to add it to their haunts. The wire I used was the black aircraft cable. If you use this version, please make sure there is a good daily inspection of the cable and rig.
I would say that if your funds allow it, go for the I-beam. You can make a quiet trolly that will do what you need.
FYI: I drew plans to get the wall-walking rig made where the actor walks around the room. I am trying to get Larry at the Darkness make it happen. If he does, the rig, will replace all the above.