There is functionally no difference between enanthate and cypionate - except cost. There are lots of anecdotal opinions (meaning those that cannot be validated by research) as to which one is smoother, which one has a longer half-life, etc., but they are just that - opinions.

If you're buying it legally, however, there is a big difference, at least in the U.S. Delatestryl (T. enanthate) is about $75 for a 5 ml. vial. Depo-Testosterone (T. cypionate) is about $75 for a 10 ml. vial. (Both are 200 mg/ml, although the Depo-T. is also available in a weaker 100 mg/ml.) Therefore, based on the math alone, I would go with the cyp.