I've had that Streetfire one on my car for the past 3 months and it's been fine. Don't know if either make coils, but heard good things about Accel and Taylor.
I used the msd coil for 2 years on the other stang n/p. If it corroded on the tip your plug wire may not have been secure on the coil causing arcing causeing it to corrode off.
On my current car with the current setup I am using the stock coil, dont know if it will be good for long on the MSD 6AL, MSD Cap&Rotor, FRPP wires.
Had a MSD Blaster 2 coil for the 4 years I owned the car with zero problems. I will add that I only bought it because the stock unit was heavily corroded, not as a performance modification.