I have both the Rossi 45 and TT 46. Neither one is tempermental and they both run really well. I'd say either engine is a good choice. The Rossi is a bit heavier and more expensive, but also a bit more powerful. I piped my Rossi and run it on a Quickee, the TT is on my sweet stick 40. I love both engines. Bang for buck would be the TT.