Both Manchester United and Manchester City don't have good performances in this season but Manchester City have worse form recently and this can be a good chance for Manchester United to beat Manchester City, by taking advantage of perhaps weakest Manchester City after a very long time with Pep Guardiola management.
Worse form?
City drew with Crystal Place and beat Nottingham, United lost against Nottingham and Arsenal, so how is this better?
Are we really going to compare Plzen with Juventus?

I am not going to say that City is a definite favorite for this but United form is far from being anything even close to it
3 matches with 4 teams I would not like to bet a penny on them, throw in the BTTS no goal and this is a ticket I would make only if blindfolded.
Good luck with it but damn those are some risky picks for just a 3.5!