I LOVE the Haiku Deck! It is so easy to make eye-catching slides and add Creative Commons licensed images. I wish it were available for Android tablets (my Kindle Fire HDX).
I'm proficient with PowerPoint and use it for library display posters. It is more powerful (can add sounds and motion) and I have total control over layout. So I would continue to do that on my PC. My Kindle can run the PowerPoint presentation. But for a quick iPad presentation I might use the Haiku Deck.