Sloth
The sloth experiences stress so rarely that researchers from the Zurich Institute of Cortisol Studies initially believed their monitoring equipment was malfunctioning. A sloth's heart rate averages 40 beats per minute, dropping to as low as 8 beats per minute during rest. Blood pressure readings suggest a creature that has achieved something approaching permanent meditative state without any actual meditation.
The sloth's stress response is so underdeveloped that when placed in mildly threatening situations, they often simply fall asleep. This is either a profound coping mechanism or a fundamental misunderstanding of danger. Either way, it appears to work.
New York City
New York City operates at stress levels that the American Institute of Urban Anxiety describes as 'clinically fascinating.' The average New York commute generates cortisol spikes equivalent to moderate combat situations. Rent payments alone cause documented psychological distress in 73% of residents. The city's signature phrase, 'I'm walking here,' encapsulates an urban experience defined by constant, low-grade aggression.
Yet paradoxically, New Yorkers demonstrate remarkable stress adaptation. The Manhattan Centre for Psychological Resilience notes that residents develop coping mechanisms that would astonish populations of calmer cities. They have simply normalised conditions that would cause immediate evacuation elsewhere.
VERDICT
This category presents no meaningful contest. The sloth has essentially eliminated stress as a biological experience, whilst New York City has transformed stress into a civic identity. Research from the Bristol Institute of Comparative Wellbeing suggests that a single day in Manhattan generates more collective anxiety than an entire sloth population experiences in a decade. The sloth wins this category by a margin that researchers describe as 'medically significant.'