I think its a dosage difference, if you type in the doses into a steroid cycle calculator/graph program 100mg of tren ace a day is equal to like 150mg of tren enanthate a day, that doesn't include the difference in ester weight/percent of actual trenbolone per 100mg of the compound
tren ace = 87% trenbolone
tren enth = 68% trenbolone
87/68 = 1.28
so 100mg tren ace = 191mg tren enth, if i did the math correctly, i probably didn't though