For me i choose Nokia N8 anytime. I am using garmin to navigate around its good.

I have good camera, good gps software what can i ask for more.
Here photos taken by Nokia N8
http://www.flickr.com/photos/thenokiagalle...57624928852359/

hmm.. so far, i heard papago perform quite well. maybe depend on area too. also, A-gps either enabled or not.
if u want more apps, more games, and u want to heavily customized your phone, definitely and android phones is better. for garmin asus A10, the community support is not vast as other android phones, such as desire, nexus one, X10. custom ROM/kernel maybe a bit less to found if u happen to like this customization stuff. and, very less number of android phones actually got front camera
symbian^3 as N8 doesn't have the best UI to begin with. IMO, the only part that i'm not really like for these symbian^3 phone is their text input other than those, they works fine though. they also comes with less powerful processor. they performance maybe not as fast as other 1Ghz smartphone. but they are acceptable, and symbian is one efficient platform. about apps, OVI currently growing, it don't have as many apps as android market. if u can live with it, less apps, not as fast as others, symbian^3 smartphone such as N8 is better compared to A10. u get the best cameraphone there

the gps part, factors effecting gps to function well, including weather, a-gps, location. so, u may want to ask those folks on android's papago thread to really clarify the performance of papago gps software.