I love Xtensio overall, but let me break down,
1. They are fast in both US and China, where I both work in 50/50
2. They have a clear idea where the tool will be used in, One pager, Persona, Pitchdeck which I use them all very often,
3. They have multiple channels for me to share, view and download, with options on how the presentation would look like to my audiences!
4. I have tried pandadoc, notion and other tools, literally 10s of them, Xtensio so far is the best product to seamlessly fit into my personal situation