To expand upon Pep's record at away knock-out games in the champions league, which is rather poor, given the players and teams he's managed, and the resources he's had:
Away CL games in KO rounds:
Zizou vs. Pep's (Barca , Bayern , City) & Pep's total:
(Wins) 67% vs. (25% , 11% , 33%) & 21%
(Draws) 11% vs. (50% , 44% , 0%) & 42%
(Losses) 22% vs. (25% , 44% , 67%) & 37%
It clearly shows that his style of play, though quite good in the league, isn't suited to tough CL games, which usually happen during the away games at KO rounds, as we've seen him get exposed time and time again.
It should be added that Zizou had a staggering 85% winrate in the league in his first season (with only one loss, against Atleti, which was one of his first matches on the bench), that'd have been more than enough to win the league in any season, but Benitez had lost so many points that Zizou still came up 1 point short. And of course he won his second league, so it's not far-fetched to say 2 out of 3 leagues (not counting Benitez' mess), and 3 out of 3 champions leagues. That's unrivaled.