SCRY and World Anvil
World Anvil is where plenty of DMs build a world before anyone rolls a die. SCRY comes in once the game is running and writes down what happened at the table, so a lot of people will want both.
What World Anvil is good at
World Anvil is a worldbuilding platform. You write articles from templates for your characters, settlements, religions and history, then tie them together with maps and timelines. If you like building a setting in depth, or you want to publish one for other people to read, it gives you a lot of room.
It also has tools for running a campaign in that world, including session reports and secrets you can share with some players and keep from others.
Where the time goes
Everything in World Anvil is something you wrote. That's the appeal, and it's also the cost. Last Sunday's session report still has to be typed up by someone, and the NPC you invented on the spot only gets an article if you remember to make one.
What SCRY does instead
SCRY records your session on Discord and builds the campaign wiki from what was said. The improvised innkeeper gets a page because she came up in the game. Each entry shows the line it came from, and you can edit anything it writes.
Your players get their own wiki with only what's been revealed at the table, and there's nothing for them to sign up for.
Which one to pick
World Anvil suits you if you want to build and publish a detailed setting, with maps and timelines, before and between sessions.
SCRY suits you if your campaign is already running and the notes are the part that keeps slipping. If your setting already lives somewhere else, bring it in as a PDF and SCRY keeps your sessions alongside it.