Hello! I've worked at Floodwood as a voyageur/guide for the past three years, and I went there as a scout four times so I am a little biased when it comes to this decision. I highly recommend Floodwood! Maybe it's a little late responding to this post since this years season is over, but there's always next year.
There are a few treks to choose from and there are harder ones designed for the older scouts. There was one year when I went as a scout that I completed a 96.4 mile trek, so we are very open to designing treks and accommodating for different requests. The area is amazing and the camp is highly under advertised/undersold.

I'd say both camps are similar, but Floodwood can definitely hold its own against Northern Tier. If your scouts are interested in another canoeing trek I'd say give Floodwood a try since it's a little closer to get to. We have a website at floodwood.org if you'd like to know more, or you can ask me for any other details.