Pay enrollment fee for GMU or wait for UIC decision

I got an admit for MS in CS in George Mason on 23 Feb. I wanted to wait for UIC's decision but didn't receive any reply till date, so now I'm showing proof of funds for getting an i20 at GMU. Should I wait for UIC's decision or pay the enrollment fee of $300 to GMU as already one month has passed since the admit letter was released and I don't want to lose my seat. #masters #ms #universityselection #studyabroad #applicationprocess #decisions #I20 #enrollmentfee #i20,