Im familiar with all three bows mentioned. If you already have a Helms Deep and are happy not sure why youd switch unless you were just plain bored of it and wanted to spend some $? The Eros has a setback handle so you might gain a little tiny bit of speed for a given brace height vs the Helms but its not anything youd be able to see without a chrono. If you have a shorter than 28 draw this might help you. The Troll is an excellent short bow very similar to a Bear Kmag but quieter and smoother. Vs the Helms and Eros Dan can build one with a very full palm swell, higher wrist and if using a heavy wood or bow bolt with phenolic add some nice mass to such a small bow, but that may defeat the purpose of a light handy bow for you depending on your desires? Really cant go wrong with any of them for a short brush bow. The Helms would work best for draws over 28 in its longer lengths. Its one of the smoothest if not the smoothest pullers Gregg makes.