just use the "default" then it will select the method that has been selected by the CLI..
In future there is no need to interrupt the boot-process at this stage as the switch will auto-select the one that is selected via the CLI (use image primary/secondary).
In your case both of the partitions use the same version, so it does not matter, but when upgrading for instance you would load different images into the different partitions.
The "with default configuration" options are to load the OS image without loading your configuration file, so under normal circumstances this should be avoided.
