I have been listening to debates about TH350 being the best for years. The TH350 is a great transmission that has proved it's self for many years, but as far as I am concerned, I prefer a 700R4. It has a lower 1st gear for better take off and a higher final drive that doesn't run the engine to death on the open road and gives better mileage. It can be used without a computer and is also very dependable.
What ever the transmission turns out to be, enjoy the car.