I know.
I'll answer your question:
Bair is a solid approach, as it has quite some priority and sets up for (real) combo's.
(First hit) Nair is also a decent approach, as first hit Nair sets up for real combo's (first hit Nair>up b/jab) and hitting with both hits of Nair sets up for follow ups. But Nair has low priority.
SH lagless Fair can be used as a fakeout, to lure out reactions to punish, or when it hits, it sets up for the flub knee>jab(>jab>grab) combo.
SH lagless Dair is also a nice fakeout (jump past your opponent>buffer turnaround jab for example) and if it does hit it sets up for (real) combo's. (Dair>jab at lower percents, Dair>sweet knee/Uair at higher percents).
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
hope I helped. I cant post it on the board, as I am not posting there anymore.