Board Thread:Versus Battles/@comment-27476383-20160306220933/@comment-27267879-20160307234913

As Cross pointed out, Deathstroke has superior stats. And to quote Rex's page:

"He is easy to anger, and when he is angered he tends to ignore any forms of reason. However, he is more dangerous, brutal and ruthless then."

So all in all, I can see Deathstroke wearing Rex down over time, ultimately Rex would get angry and would begin to go full on attack mode, but despite being more dangerous and brutal like that, he would still get defeated by Deathstroke. After all, Slade is a very intelligent individual, and against a berserk opponent he would have no problem ending the fight using his many strategies and whatnot.