When I am looking for cheats, I am looking for something that I can use to my advantage, but still look completely legit to any spectators. I can confidently say that the MW/Warzone Classified ESP allows for this. One of my favorite options is VisibilityCheck, because it shows you which players you can and cannot see. This really helps with hiding the cheat and being able to come up with an explanation if you do happen to do something sketchy because you know exactly where the enemy is and whether any part of them is visible on your screen (ex. you saw part of them through a crack or hole that you can point out in a killcam).
Something that I would like to see in the future is possibly an option to only have visible players appear with the ESP. This might sound silly or unnecessary to some, but having a player become highlighted only when they're visible will only take making yourself look legit to the next level, and still give you a visual advantage over other players.