Never use the roofs yet always pay attention to them, they are good getaway while also being home to bad players.
Master the smoke bombs as they are only the line of defense, if you think you are being followed, likely chance you are. After you use it however punch and run or just run if you have more than one pursuer.
My personal pick but poison, reasons are because it does get you out of killing animation which can get you caught. Templar vision also works but has a huge glaring weakness. You light up like a Christmas tree and since you need to see your target for use, they can usually see you, Never threaten your disguise.
X5 score needs to be on of your perks.