I am going with the Geno test.
Peterman was a rookie in his first start. Geno, on his 24th start, threw 3 picks on 8 attempts with 2 completions in the first 10 minutes (before he was pulled). In contrast, it took Peterman 13 minutes and 40 seconds to throw 3 picks. Guess Peterman needs to work on that. Like Geno, Peterman had 8 attempts and managed to completed 4 of them. To his own players! Oh, and Geno got a whopping 5 yards on his 2 completed passes while Peterman managed 39 yards on his 4 completions.
That being said I think both of them will have fine careers in the new XFL.