Lion
Lions maintain a frustratingly inconsistent schedule, spending up to 20 hours daily in horizontal contemplation. The Kenya Wildlife Predictability Survey notes that tourists have a mere 23% chance of witnessing active lion behaviour on any given safari. The remaining 77% involves watching a large cat sleep while a guide whispers enthusiastically about what it might do if it weren't unconscious.
Sunset
The sunset arrives with Swiss timepiece precision, occurring exactly once every 24 hours at mathematically predictable coordinates. The Greenwich Observatory Dependability Report confirms a 100% success rate over the past 4.5 billion years, with no recorded instances of a sunset failing to appear due to illness, mood, or prior engagements. This represents an unmatched record in natural phenomenon reliability.
VERDICT
The sunset's unwavering commitment to its schedule establishes it as the clear victor. Unlike the lion, it has never once cancelled a performance due to excessive napping.