That's a tricky question! It depends on what kind of microscope you're using and what you're looking for.

Here's why:

* Microscope types: Different microscopes are designed for different sizes of organisms. A light microscope is great for viewing single-celled organisms like bacteria, algae, and protozoa. An electron microscope is needed for viewing even smaller structures like viruses or internal components of cells.

* Size matters: Very small organisms, like bacteria and viruses, are invisible to the naked eye and require a microscope. Larger organisms, like insects or plants, can be partially observed without a microscope.

Examples of organisms best viewed with a microscope:

* Bacteria: These single-celled organisms are only a few micrometers in size, making them impossible to see without a microscope.

* Viruses: Even smaller than bacteria, viruses require specialized electron microscopes for visualization.

* Protozoa: These single-celled eukaryotic organisms are larger than bacteria and can be seen with a light microscope.

* Cells: The individual cells that make up our bodies and other living things are too small to see without a microscope.

So, there isn't one "best" organism to view with a microscope. It all depends on the microscope and what you're interested in seeing!