Use 'preferable' to express that one thing is more suitable than another, often because of specific qualities or circumstances. Walking is preferable to driving in heavy traffic.
Pro Tip 2/3
Subtle Preference
'Preferable' conveys a mild and not strong preference, suggesting a gentle recommendation rather than a command. Using public transport is preferable for the environment.
Pro Tip 3/3
Context Matters
'Preferable' often depends on context and personal opinions, so its use can be subjective. For allergy sufferers, hardwood floors are preferable to carpet.