Since discovering OSM about 6 months ago and realising they'll work on my Garmin I'm always curious which maps to use. For example the new Garmin Europe City Navigator 2014.20 maps or OSM. I often end up taking both, just in case but use the Garmin maps most of the time. However I can certainly see that changing should I go to Mongolia or similar.
I have 2 sites I enjoy looking at. One overlays OSM (or another) data real-time on Google Maps so you can see the differences, just use the slider at the top to increase/decrease the transparency:
transparent map comparison openstreetmap google bing yahoo
The second site I use has any 4 maps in quadrants so you scroll on one and can see the differences between 4 map-sets.
Map Compare | Geofabrik Tools
Maybe someone will find it useful if they're not already widely used and I'm just late to the party
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