Offense and momentum are advantage Diamondbacks. The Diamondbacks are riding a 3 game winning streak, largely due to their excellent offense (with honorable mention that Merrill Kelly pitched a gem). That contrasts with the Padres. In the last month their offense was anemic, and in their 3 latest games they lost a series against the Dodgers.
Pitching is a tossup. Both teams’ rotations are less than full strength. The Padres will be without Michael King and Yu Darvish. The Diamondbacks will be without Corbin Burnes and Jordan Montgomery. The series winner will likely have starters who pitch deep and bullpens that avoid meltdowns.