Have to go with Silva at this point, I don't think he could sit back with cung le and have one of those lack luster performances. I 've watched cung le in mixed martials arts with a bit of a skepticism. Le has definitely more hittable than he was before (San Shou) and have see him even rocked on occasion.
With Silva's proficiency on the attack, I can see Cung Le being battered to a decision loss, simply because hes a little rigid and has never really had to fight at another fighters pace before. He can take abuse, but I don't know if he could really mix it up like he would be forced to with Silva as the both seem to prefer stand up now. Cung Le scissor sweeps used to be a thing of marvel, but in MMA, it wont get him any points unless he can follow up with a submission or quick ground and pound.
The xfactor though is that Le can hurt you with those kicks even while you're defending, like when he broke shamrocks arm.