Having you cake and eating it too
As the osm maps are 'free' I'd suggest getting them and comparing them to ohh google maps for detail. You used to be able to look at garmins maps on their web site so you could see their detail too. Don't know if that is still the case? If not then a local garmin store might let you have a look at the detail on on of their demo units?
You can have both osm and garmins maps co exist – this way you can chose which one is 'best' (which can change depending on where you are and what you want to do).
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