Gosh, I can't really imagine there's a huge number of people on this site who have seen both of these shows. However, I happen to be one such person. That said, it's....been a minute since I've seen either of these so my response is mostly just going off vague memory. I'm going to go with the Sentinel, as Fawkes would still be audible and so, easily tracked, and perhaps the fact that he gets incredibly cold (IIRC) would be another indicator of his location and enough for him to catch a bullet.
Hahaha Round 2 should be against the Pretender