Sub panel & isolation transformer voltage


Is there an advantage hooking up 240V to the IT then stepping it down to 120V to the sub-panel or is 120V straight good enough.
homer
A great question for Sean or someone else knowledgeable. I hope they answer!
I have been experimenting with 120v (vs.) 220v to 120v. I'll get back to you and let you know.
I have arranged my panel so that loads like the dishwasher are on the leg that is not running the audio. Similiarly the fridge, washer, large motors that kick on by themselves. You have three lines coming to the house- one neutral and two hot. Put the two hots on one circuit and you have 220. Only one hot is 120. So I keep noisy junk on the other leg (other hot). Of course, you are still connected to your neighbors junk.