I can see an incomplete post here in the QuickBooks Community forum.
If you need to know which version of QuickBooks Online (QBO) you need to get, please check this out: QuickBooks Online Comparison. It includes features and current rates of the product.
However, you may need to consider this to ensure QBO is best for you:
You are a business owner, not a sole proprietor (either C-corp, S-corp, Partnership, or multi-person LLC).
You have employees.
You need estimates.
You need to track inventory.
You need bill pay or payroll.
Otherwise, you can select QuickBooks Self-employed if you're a freelancer, independent contractor, and home-based entrepreneur. Feel free to read through this article: QuickBooks Self-Employed Overview.
You can also find a QuickBooks-certified ProAdvisor who can provide strategic insights to help your business needs.