Color for geometry selection?

For a graphics application which selects vertices/edges & polygons, the color for highlighting selection needs to be easily identified.

Unlike typical text-selection it's overlaying solid geometry which has it's own shading. There are sometimes cases where selection is harder to see.

When testing colors I found some stand out more than others, although some people who tested this didn't find this to be the case. See image below.

Is there a deterministic rule for humans color perception which can help guide this choice or is this arbitrary?

In this example the colored geometry is selected.