st.mp is the best and go-to frame trap (+3 on block I think),
b+hp has its uses (if you vtrigger it and you get counterhit, you can confirm into crazy damage. But has to be a read, cause you can’t confirm the b+hp, only if it’s a counterhit),
bck/fwd.mp, very rarely (combo’s into EX.legs/super on CH). Can also vtrigger it if you’re confident it’s going to hit and convert to insane damage.
cr.hk xx vtrigger has some uses, you’re +5 (and can get some funky setups out of it on block, like instant stomps)
Still, the best, most consistent one to use is just st.mp.