Tren tabs are methyltrienelone (a.k.a methylated trenbolone). It was probably created because most people don't like daily or EOD injections. I would conjecture that it would have the same effects as tren acetate with the added bonus of being liver toxic! I've heard great things about it, however why not just take the injectable and spare your liver? Tren is more "advanced" because the sides are pretty hefty for some, and it would be better used for most in later cycles, when growth from simpler compounds has decreased.