I'VE CHECKED INTO THOSE 2 SYSTEMS AS WELL. I DO KNOW THAT THE EDELBROCK COMES WITH A HAND HELD THINGY THAT LETS YOU CHANGE VALUES WHERE AS THE ACCEL UNIT REQUIRES A LAP TOP. SO IF YOU DON'T HAVE A LAP TOP YOUR EFI COULD COULD COST YOU $2000 PLUS THE PRICE OF A LAP TOP, OR YOU COULD DRAG THE DESK TOP OUTSIDE TO THE TRUCK. MY WIFE WOULDN'T APPRECIATE THAT

GOOD LUCK IN YOUR DECISION.