No. I did have both at one point and couldn't change that option.
Im guessing since I uninstalled BB maps, that option has disappeared.
So perhaps as google maps is the only one installed, it may default to that?
"That's it then. Cancel the kitchen scraps for lepers and orphans, no more merciful beheadings... and call off Christmas."
I suspect Advanced -> Maps is an options screen for BBMaps that introduces the possibility of the application using different source data at some point in the future. But that is just a WAG based on the fact that the option matches the LbsConfig service book name.
My other Blackberry is a PlayBook.