What is the most useful AI tool for Making Slide Presentations in 2026?

I'm trying to find an AI tool that would allow me to build and edit professional slide decks by prompting. I'd like something with a free tier but if there is something that proves to be useful i'm happy to pay for a tool.

I've tried a few options already like Gamma and Gemini for slides but haven't found either one to be very effective. I'd like any tool to be able to generate designs, format content, use consistent layouts and themes, and - if possible - have the ability to embed images and data. I'd like to be able to create slides that are stunning and professional while also being able to use my files.

What have you found to be the most useful AI tools for making presentations?