I'm also leaning towards the cd:ngi imagery because of more generally consistant alignment. Whatever your preference, it's still a good idea to check the alignment with (good quality) GPS traces (if available).
I have found having multiple sources available is useful for comparison (e.g. that lake runs empty during the dry season, that road construction is complete, or that amusement park used to be an airfield). Even though the imagery date isn't available.you can often find clues as to which source suits your purpose better. -- Glen
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