Yes, both Microsoft Planner and Notion offer a Free Trial.
Microsoft Planner is designed for Large Enterprises, Medium Business and Small Business.
Notion is designed for Individuals, Freelancers, Medium Business and Small Business.
Pricing for Microsoft Planner Starts at $10/user/year when yearly whereas for Notion Starts at $4/Month when Billed Yearly.
Some top alternatives to Microsoft Planner includes Connecteam, Smartsheet, Miro, Todoist, Notion and Process Street.
Some top alternatives to Notion includes Jira, Knote, Trello, Confluence, Asana, Easynote, ClickUp, TWiki, MeisterNote and Zenkit Hypernotes.