I don't really think it matters, and as far as i know neither will have an effect on your H/H values. They are both ACE inhibitors, essentially they decrease your blood pressure by causing your peripheral blood vessels to relax and dilate. They are both relatively safe, the biggest contraindication with Enalapril is make sure you don't have any renal deficiencies i.e elevated BUN/Creatinine or a low GFR (Glomerular Filtration Rate). The biggest risk factors with most ACE inhibitors is angioedema (swelling) of the face and tongue but is rare. Hope that helps!