There's only 2 differences:
Cheap packs usually won't be as fast in mod and power hungry classes, due to amp draw issues. I have had even IP packs puff in mod sprint car on dirt oval..TP never fails, including my old ass 40c 5000.
And on the puff issue, the cheaper packs seem to puff more often. The TP packs I have are going strong, and the aforementioned 5000 40c has seen many cycles in sedan, dirt oval, f1, etc. etc. in the 1 1/2 years i have had it. They take abuse.
In the end, I have quite a few packs of different types, but i really only need/use the 2 TP packs i have.