I disagree with you here. I actually think the Cubs have more ways to win. They can score more than the Padres, and they play great defense. The offense can score 6 or 3, and they're in it.
The Padres, OTOH, are built to win low-scoring, close games. If their bullpen or starters falter (and give up 3 or 4 runs combined) they are really going to struggle to beat you. If you score 6, they're more than likely toast. If you score 6 against the Cubs, PCA and Bregman might each hit two homers, and you lose anyway.
People freak out about bullpens, but really, who has won in October with that as the main strength since the 2014 and 2015 Royals?
Give me San Diego all day, and that's not even considering the mental health factor.