If you want everything you've listed DPS is the only way to go.
iBooks Author may give you more than epub but it's also going to pretty much be iOS only.
BTW, DPS SE which is included in CC is iPad only.
You might want to get a copy of the book Diane Burns and I wrote, Digital Publishing with InDesign. It explains what all the different formats can and can't do. It also gives you how to steps for creating interactive PDFs, ePubs, and DPS apps.
Thanks, what level of interactivity is possible using .pdf (or epub if that is supported well across devices)? Most tutorials I'm finding refer to forms when speaking of interactivity, but I'd really like to have swipe-able photo galleries at least.
can be added to DPS apps but I'm not sure how you'd go about doing it with
No way I know of to do that with PDF.