My question is simple:
When should I use shieldbreaker and when smash?
Im very new to ssbb and hope this is no "noob" question.
first you'll have to learn your opponent. basically about their shield habits.
I've used shieldbreaker and Fmash when people are dashing towards me...
with the caveat that you miss and either attack leaves your incredible punishable
If you play with people who roll and side step frequently (more than run shield, shield cancel or pull out their shield) preferably, Fsmash
more competitive players function with shield a little too much... i mean to say they use all of the methods to prevent damage.
People who try to shield->grab or dash -> shield -> grab or just dash -> grab, use your spacing and shield break them...
Also, its a situational recovery move... there's proper timing... and its actually to situational to use it as a recovery... (Charged)
DON'T even use uncharged off stage if your opponents are 'gods of offstage' Meta, Falco, etc. (you're better of fairing towards the stage)
For smashes...
Fsmash -> when you get opponents to 60-80% aim for a tip--DO NOT SPAM THIS (even then)
Fsmash when you KNOW it'll contact... untipped Fsmash is garbage, but don't miss the opportunity to hit them with 15%
Dsmash -> if your facing them it comes out fast, away... they can cancel it with a grab or a punishing blow. There was a phase when I replaced Fsmash with Dsmash, wasn't very viable.
I replaced most of my Fsmashes now to Dtilts.
Usmash -> Gliders and Illusions... mind games.. very few people will say to use it as a edge guard... I still believe if you want to spike someone Dair... Usmash is not reliable for such tactics...