I'd say starting pitching is a wash, but Seattle probably has the edge in the pen.
To answer a previous question about things being magnified... I think most people mean that anytime anything happens in the playoffs, its more impactful since the playoffs are all really a set of very small smaple sizes with large potential variances. It's not some 162 game marathon where a runner can flip their shoe off in the first few minutes, stop for a second or two, put it back on and keep going and have the entire race to make up those seconds. It's a sprint where if you lose your shoe out of the block, you B f***ed.
Thats why people harp on the small ball thing for the playoffs, because in those scenarios where a team does execute the things that get them that 1 run, it means more in the small sample size. It's no longer about number crunching a 162 game season where giving away 100 outs is incredibly stupid, but rather giving up 1 or 2 outs out of 54 (possibly 81 if it goes 3) to really roll the dice since the payoff is bigger.