Steve~
I have shot both and currently shoot a 3 piece Thunderhorn Heartstopper almost exclusively..The Centaurs, to me, were too light in the hand, but they are performers! The Centaurs have zero handshock and cast an arrow with authority. However, I will say that the Thunderhorn has the edge. Chrono'd my 60", 53@28" Heartsopper this past weekend, with a 585 gr CE Heritage, at 28.5", and was consistentley getting 174 FPS. The craftsmanship is above and beyond the best, with the fit and finish supreme. Flawless workmanship. Stippled grip is a must have. They balance well, and the grip is a killer. A good friend of mine just acquired one, and he said that after 45 years of shooting longbows, that it is the nicest shooting longbow he has ever owned. Another plus is that Kim and Duane Jessop at Thunderhorn Archery, are some of the finest folks to deal with when it comes to longbows and custom Boa quivers.