I've never used Nobletech myself, but have talked to a number of people who swear by it. However, with it's merger with MaxSea, it is evolving to be more like MaxSea, and a number of people I talked to are not liking it so much any more.
I've used MaxSea personally. It's best trait is that it integrates well with Furuno's NN3D system, and I think their TZTouch stuff as well. Other than that, I really dislike it. Just as one example, it has two operating modes: Planning and Navigation. Certain features are only available in one mode and not the other. But to switch you need to shutdown and restart, and that takes several minutes. It is VERY slow to start up. It also does a poor job rendering vector charts with duplicated labels all over the place. It makes reading the charts a lot harder than it needs to be.
I'm now switching over to Rose Point Navigation's Coastal Explorer. It's very reasonably priced (about $400) and to my mind is much better thought out than MaxSea, easier to use, faster, etc.