I'm hoping I understand the motivation behind your question... Why worry about the payout when you'd learn much more trading with a real Ibank? If Schonfeld was paying 20% I think it's still better to go with the Goldmans, you'd gain a much more indepth knowledge...
Steven Schonfeld is the best in the biz, and has many very smart traders working for him, to even be considered you have to prove yourself with small size first.