Left, but it's not quite an apples-to-apples comparison because the left one feels a lot more crisp in terms of the lettering and art. Though I'd probably go with left either way.

Haven't played the game obviously, but this is an age old question of game design. This exists in US vs Euro board games as well - being out and no longer playing, or being in but effectively unable to win. In this particular game, could you see offering player choice? Play as Zombie or sit out?