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The one that was installed last will be at the top. But you can change the order of Windows startup in the settings. And, you don't need to install an antivirus on one of the Windows installations.
System boot time

Website loading time in Chrome

To make it load and work faster.
On one - 360 Total Security
On another - Avira
On another - Comodo
And then, sometime later, run a thorough check of the HDD with three different antiviruses and download CureIt as well.)))
Added 1 minute later
Oops! Not Panda! Comodo! For the thrill! )))
System boot time

Website loading time in Chrome

To make it load and work faster.
On one - 360 Total Security
On another - Avira
On another - Comodo
And then, sometime later, run a thorough check of the HDD with three different antiviruses and download CureIt as well.)))
Added 1 minute later
Oops! Not Panda! Comodo! For the thrill! )))