In this case it seems that Google's database is much larger then Bing's. That's probably the case in a lot of areas then as I'm sure not a lot of people have much interest in that area.
You can zoom in on Bing, but there will be no labels. I've not really played with Bing at all so I don't know what you might be able to do, but can't you place pins in FTM? That might be the only thing you can do.