The speed passion is much more smoother than the tekin and hence easier to drive. But I like the speed passion more, because given the same straight line speed I have seen the speed passion to run cooler than the tekin. In the last big race I went to, the tekin smoked a lot of motors.
The Speed passion, you don't need a laptop or computer to make adjustments as well.
For novak motors, the ballistic or SS is good.