I adore Test, it builds muscle tissue for me like no other, I feel so good on it and my over all performance when using it goes through the roof so I would have to say Test. Tren is very powerful and test and tren together is probably the best combo for me. Tren can be very harsh for some users but if your one who responds well to it your going to see some serious developments. I don't use tren anymore because it doesn't really make me feel that good while using it but in my early days ive used buckets of this stuff but at all times along side my favourite king hormone Test.