Best way to View Powerpoint Presentations on Ipad
If you are looking just to view, you can convert your slides to PDF and use iBooks.  If you also want editing capabilities, Keynote is indeed the best way to view and edit slideshows on the iPad. it carries the advantage of being tailored for your device. Keynote is Apple's version of PowerPoint, so it can edit and view slideshows. Just so you know, you won't achieve 100% compatibility with PowerPoint, but it will be pretty good. I use Keynote and I'm continually surprised by it's abilities and it's depth. I say, go with keynote.