Can't decide who to play mid lane

I'm suck between starting Ryu or Pobelter mid in my roster this week. Ryu has been my starter up until now but after last week's showing i want to potentially start Pobelter. The only thing that concerns me is that CLG's schedule is a bit more difficult than H2K's. CLG faces Gravity and Enemy where as H2K has SK and UOL. I think Pobelter has the larger potential to give points but I'm just concerned he may be hindered by the quality of his opponents.