This is DiMethyltestosterone, or Methyltestosterone with an added methyl group (hence "dimethyl") at the C7 position. I think, any further comparison to Methyltestosterone (except perhaps with regards to hepatoxicity) wouldn´t really be warranted.

It needs to be noted that a lot of what I´m going to tell you about this drug is basically speculation for now, although I suspect that since we´ve seen the reemergence of several drugs which wear gone for decades (Mitolan, OT, etc& ), this one isn´t far behind. Why would this stuff reappear on the market? Well, by taking a look at its androgenic/anabolic ratio, you should see why. It´s three times as androgenic as testosterone and almost six times as anabolic! This makes it one of the most powerful oral anabolic steroids ever made.

Source: steroid.com