So, was playing with Terry and was trying to apply some knowledge of hitstun for st.B.
It's usually a fairly strong pressure tool, but you can't net anything from it. Especially close up as the only thing you can connect into it is an EX special.
This actually isn't true.
Terry's st.B gives you about 4F+ advantage on hit due to hitstun. I don't know the EXACT frames, but yesterday, I could link df+C into st.B. Today, I did st.B point blank and did close st.C, which connected. Both of these normals are 4 frames. I wonder if it links into itself.
Anyway, TL;DR -> st.B into df+C or st.C is a link (Not a cancel, a link). It's probably a 1 or 2 frame link.
EDIT: It apparently doesn't link into itself so st.B into st.B doesn't work. That probably means that st.B is in fact slower than st.C which means it's slower than 4F
Definitive proof st.B was nerfed from Arcade!