If Santos was as quick as clichy, i would pick santos as first choice LB over clichy . However, clichy isnt a bad LB, its just that he has his moments, he can be very unpredictable and you dont know what to expect from him in 90 minutes. So i would go with the more reliable santos, who is better technically, comfortable on the ball and more decisive going forward. Santos edges it for me.
Santos simply due to the fact that he's yet to make a really stupid mistake that cost us a game like Clichy used to.