In part, it depends on what you're trying to accomplish. If you're doing a UX review or feature demonstration, then screenshots might be ok. In most other situ

In part, it depends on what you're trying to accomplish. If you're doing a UX review or feature demonstration, then screenshots might be ok. In most other situations, screenshots are hugely distracting. They force your audience to focus all their attention on details of your slide, rather than the things taht you're saying.