You want one from each group: (for your experimentation of lab rats of course)
A. GHRH CJC1295 DAC, CJC1295 no DAC (aka GFR Mod-29 and CJC 1293)
B. GHRP - GHRP2, GHRP6, Ipamorelin, Hexarelin, etc.
From what I have read the DAC version (drug affinity complex) causes a constant release that does not mimic natural pulses in males. I have no real experience in working with DAC, but I would suggest a different GHRH so that you get a burst more like a natural pulse. Unless you are using female rats, because in that case non-pulse slow dribble of GHRH is more of what their pattern is.
Results will vary based on the animals response to the peptides, diet, exercise, sleep, etc much like anything else. Hope that helps!