My favorite player depends on the situation. I usually play to win and not so much on individual statistics and kills. Im more like a team player going for the win.
If the team lacks the offensive attack to capture the objective, i play as Corn or Peashooter, engineer and mech to clear out the space or to get as much multiple kills.
But if there is one character that i absolutely love, it is Stuffy Flower. When played correctly, she can be deadly and can heal and do a swift revive. I love playing as Flower with all her challenges being soft in terms how much damage she takes, yet can heal herself and at the same time, can absolutely wreck just about anyone. On the zombie side, its the engineer welder and scientist paleo.