Jeep grand Cherokee programmer, or chip?

As i start doing modifications for my car i came across the uses of programmers, and performance chips. Do either of these really give your car a performance boost, and how much?

I have a 2002 grand jeep Cherokee 4 liter 6 cylinder.

I have heard the best programmer for this car is Superchips Power Programmer - Flashpaq

I also heard the best chip for this car is Jet Chips Performance Module and Chip
 
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