O'Reilly or iBooks? Which is gives the better/wider exposure?

I joined recently, trying to get my hands on the 'free' offer of your 'Publishing with iBooks Author'.
Didn't seem to want to part with it!
Then I wondered whether you offer the same sort of service as iBooks. Do you?
I've just completed a short children's story and illustrated it - hence the reason for wanting to find out about iBooks Author.
Do you publish works in the same way or do you employ the same process as traditional publishers - but with the additional 'perk' of the digital version?

I look forward to your reply

David G. J. Nolan
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