The best method of presentation of data is tabular. This is because tabular presentation organizes the data in a systematic and easy-to-understand manner. Let's understand this in detail:

Benefits of Tabular Presentation:
1. Clear and concise: Tabular presentation presents data in a clear and concise manner, which makes it easy to understand.

2. Easy Comparison: Tabular presentation allows for easy comparison between different sets of data, which is useful when analyzing trends or making decisions.

3. Efficient: Tabular presentation is an efficient way to present large amounts of data in a small amount of space.

4. Easily Readable: Tabular presentation is easily readable, even for those who are not familiar with the data.

5. Flexibility: Tabular presentation allows for flexibility in the way data is presented, making it easy to add or remove data as needed.

Disadvantages of Textual and Diagrammatic Presentation:
1. Textual presentation can be difficult to read and understand, especially if the data is complex.

2. Diagrammatic presentation can be confusing if the data is not presented in a clear and organized manner.

3. Diagrammatic presentation can take up a lot of space and may not be suitable for presenting large amounts of data.

Conclusion:
In conclusion, tabular presentation is the best method of presenting data as it is clear, concise, easily readable, efficient, and allows for easy comparison of data. Textual and diagrammatic presentation may have some benefits, but they are not as effective as tabular presentation.