If you have thought that hard about it I am sure it will be the right decision. I have been thinking more about it as well, every engine has slightly different power and torque bands, this will make a big difference in how well it works with your engine also. Unfortunately you will not know for sure if you made the right decision until they they are mated up, in the car, and driving. In the end either one will work fine, but hopefully you chose the one that is the best fit for you.