What is the difference between discounts and onboard benefits per tier level?

Benefit: a reward tied to specific tiers, with certain benefits only becoming available upon reaching a designated tier status.

Discount: tiered price reduction that grows in value as Latitudes Rewards members progress through the tiers.

Onboard Benefits per tier level are available on cruises five nights or longer.

Onboard Discounts per tier level (including pre-booking of shore excursions) are available on all sailings.