TST is considered the best by some people who wish to make alot of power. However, "turbo bark" is not a TST thing... it's a common occurance on many modified rigs using many different combinations of aftermarket components. Like I said, if you roll in and out of the throttle slowly, it's no big deal. The "bark" is more pronounced at higher settings, but it can happen at any setting when the boost is high and you let off the throttle quickly. The EZ stack simply dampens the sensitivity of the bark... in other words, I've found I can let off the throttle a lot quicker without making the turbo bark. They are both great chips, and both use different approaches in producing more power. Don't just take my opinions, though... read what some of the others have said. Tommeygun's articles have been particularly helpful to me. He is running the TST/EZ stack, and he has indicated that larger turbo and injectors help maintain driveability even more. Of course, with a bigger turbo and injectors, you're also have to going to have a clutch or transmission upgrades, pusher pump, cp3 mod, etc. It's all in how much you're wanting to spend.
The TST is one of the best for big power gains. However, it is a little slow to spool on the low end, and the power distribution is not quite linear with throttle position. The EZ stack helped address these issues for me, as well as suppress the "barking".
Hope this helps...