The latest version of Microsoft Office as of my knowledge cutoff (September 2021) is Microsoft Office 2021 for Windows and Mac, which is available as a one-time purchase.

However, "best" is subjective and depends on the specific needs and preferences of the user.

If you are looking for the most comprehensive and feature-rich version of Microsoft Office, Microsoft Office 2021 would be a good option. It includes all the traditional applications such as Word, Excel, PowerPoint, and Outlook, as well as some newer applications such as Microsoft Teams, a communication and collaboration platform.

Alternatively, if you prefer a subscription-based model, Microsoft 365 is another option. It includes all the applications and features of Microsoft Office 2021, plus additional features and cloud-based services such as OneDrive storage and Microsoft Teams.

Ultimately, the "best" version of office tools depends on factors such as your specific needs, budget, and preferred payment model. If you are not satisfied with what Microsoft Office offers to you, you can hire freelance office tool services that provide custom office applications. You can find all of those freelance services on various e-commerce sites for freelancers on the internet. Their services often come with high quality and affordable prices depending on your budget.