If you're running short-acting compounds, I'd stick with tren acetate. Tren enanthate if you're using long-acting compounds. If the blend has both short AND long esters and you don't react well to it, you'll have to wait weeks for it to clear. Also, tren blends tend to contain tren hexahydrobenzylcarbonate(the original "parabolan" ester' and that ester costs about 2x as much as the other 2 do in raw form.