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Half Bridge Converter output filter: Common VS Separate Inductor per Rail

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sbdada:
Hello,
Let's say I've a half bridge converter with some symmetrical split output, for example: +-12V, +-24V and +-35V with a common ground. In this case, which type of inductor should be used:
6 output here, so 6 separate inductor on 6 separate core for each of the output?
Or, all 6 inductor coil on a single core?
Or, all positive rails on one core, and negative rails on another core?
Which one has the advantage?

To Yansi, if you see this post: After making a new PCB, that transformer driven half bridge working very well. But I did some changes on output. I thought If I make it for +-35V and if it really works,  then I can replace that bulky transformer of my amplifier, so I changed that from 12V to +-35V. Now it also has a +-12v rial for preamp. I've also added the overload protection by sensing the primary current with an small troied, that also works fine.
Now I'm a bit confused with that inductor and also the polarity of their winding.

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