Jason, that is a Dolly Varden. All N Slope Alaska/Yukon chars are Dolly Varden.
The Tree is famous for a reason. If you have the money, go there. Hands down the best in the world.
Ekaluk, while having probably the best and brightest fish, is heavily utilized by a commercial net fishery and the fishing can be very spotty in some years. There are also plenty of cheaper, easier to access rivers in and around cambridge bay which will produce, but not as famously as the big name systems. Most of the systems around cam bay have commercial fisheries on them of one kind or another, which obviously can impact angling.