We use Microsoft PowerPoint which is used predominantly worldwide. Alternative presentation software like Prezi and Keynote do have their own advantages. However, we believe PowerPoint is the best tool when it comes to creating editable, fast & professional presentations.
Also, the content and design approach of your presentation is always the KEY SUCCESS FACTOR, rather than the tool we use to create the slides. Finally, what matters most is whether the point you are trying to make is delivered effectively. A well designed slide will always make its impact irrespective the software it is created in.