Like dewophile I would think the Prove 3 trial would offer a better chance of a successful outcome , though I don't know much about GI-5005 and Schiff presumably does.
One thing to look at to help you decide -- the enrollment rates of the trials , as a means to weigh the perceptions of the medical / patient community about the tx. in question. VRTX will enroll hundreds of patients for Prove 3 in a matter of months , while it looks like the Globeimmune trial has been enrolling since '05 to get 48 patients. Enrollment criteria and other factors can influence this , of course , so it's not foolproof.