St.B is easier. You can do that st.B into EX Powerwave anywhere as long as you time it right. It allows you to keep the pressure up, yes, but you have other options if you have meter.
You could use that meter to do EX Crackshoot instead of st.B, EX Powerwave. They're gonna get pinned down and you can setup for hard knockdown shenanigans (Meaty rolls, cross ups, fake cross ups). You could use that meter and do buster wolf as well. You're dealing damage, but you recover faster. See although Terry has soft knockdowns, teching the SKD is a bad idea.
When you tech a knockdown, you forfeit all through invulnerability. They second they get out of the roll, they're vulnerable. This is the perfect time to just walk in on somebody. You can literally hold forward after someone's been hit with Buster Wolf and walk up to them. If they tech, you can run in and go for a throw. If they don't tech, you can do everything you could have done if you hit them with EX Crackshoot.
Using EX Powerwave would be the more ideal approach if you did it in the corner or closer to the corner. They wouldn't be knocked farther away from you, they could only GCAB one way, and you're still in a position of power. That's the point here. You are doing this so you aren't losing control, right? So use your tool in the best position, when they're cornered and they want to get out.