Here's a main part of ERC-721 that is relevant to your app.
ERC-721 lets you make a thing and then later come back to quickly find out who owns that thing. ERC-1155 does not support that use case.
You are still very early in your design so you probably want to spell out an idea of what you want to try before asking detailed questions.
I have a Community ...
Using 721 or 1155 depends on the type of assets you want to add to your system and the growth you expect for your project. This is: if you're totally sure that you won't need anything else than:
Store notes, with links to IPFS.
Pay for them using the native token of your blockchain.
Then you will be OK with 721. Now, let's think another scenario: You ...