Which "pooling" do you choose?

In the main "pooling" method, there is max pooling.

If the background in a figure is almost uniform, "Max pooling" must be best practice.

Is that right?

I tried the following.
1. Conv pooling
2. Conv pooling and max pooling
3. max pooling

The accuracy of each method is following.

1. 98.5 - 99.1%
2. 99.0 - 99.2%
3. 99.3%

Therefore, If the background in a figure is almost uniform, "Max pooling" is best.