Notable Difference(s) between shieldbreaker / Fsmash?

[iCrash]

Are there situations where I should use Shieldbreaker instead of Fsmash, and what significant differences are there between NeutralB / Fsmash, other than obviously being able to use Shieldbreaker while in the air?

 

[Mr_towel_Man]

If you need range and power use F-Smash. If you are trying to break shield then that's when you should use shield breaker. if you do break shield, then charge shield breaker. F-smash is a good, quick powered move as long as you tipper it. Just some basic tips.

 

[aqualad33]

You can start a shield breaker from the air so it makes it useful against spacy side B's like fair but without potentially poping them up instead of out. Also I like to use it as a whiff punish on rest.