For strict brand compliance, Plus AI is my go-to. It sits right in Google...

https://wiki-fusion.win/index.php/What_Changed_in_AI_Presentation_Makers_Since_the_%27Demo-Only%27_Days%3F

For strict brand compliance, Plus AI is my go-to. It sits right in Google Slides and makes PPTX exports painless. It handles font substitutions accurately, so your decks stay on-brand during the transition