I have been thinking for a while about getting one of these two chips for my 5.7 L.

Either a Superchips Tuner or the Hypertech Programmer III. Can anyone give me any information if one of these is better or worse? Obviously I'm trying to get more HP, not better mileage.

http://www.superchips.com/html/mainpage/index.htm
http://www.hypertech.com/three_stage.html