Different quarterbacks do get treated differently by the refs, and for good reason. I recall Vick complaining that he wouldn't get the roughing the passer calls other QBs would get. Obviously, that was a result of Vick's style, and I suspect that there is that sort of judgment being applied here, and rightfully so. That play probably would have been called a sack on other QBs, including Brady. But, the refs know that TT has far more ability to escape a sack than most QBs and were willing to give him the chance.
If Suh is a little gun-shy in how punishing he is to the QB, based on his past performances, and subsequent fines, and suspensions, he has nobody to blame but himself. And, the majority of those instances occurred after the whistle was blown. That's what has made Suh one of the dirtiest players in the league.
But, nobody was stopping Suh from wrapping up TT, other than his own inability, and TT's ability. Suh knows how to make a legal sack without "slamming the f**k"out of the quarterback. The refs made the right call, imo.