MicroTECH/Power FC/Haltech?

I'm runnig a 1993 RX7 (FD), really don't know which one is good for the car. Road course racing only. Which is less likely to fail? Basically i'm like everybody...wanting the best for a less price. I am well aware of the price on all three products but which one has more features?

If Power FC, what are the benefits compare to microtech or the haltech?

Thanks

-joe