Neither...Stage 4 hd kit wont give you the most bang for the buck. Procharger will give gobs of power, but be focus on top end and will also find your drive line weakness' pretty fast.
There are many builders kits out there to install that will give you a great bang for the buck. Baisley, tman, gmr, hyperformance, etc....etc...Anywhere from 100hp to 120 hp and tq is easily possible. Exhaust and tuner is a must either way you pick.