Dthrow to turnaround jab reset is standard. Works unless they DI away (behind/away from you) up until whenever jab resets don't work anymore (mid-upper 30s?). Buffering dthrow with c-stick helps beat their DI.
Obviously techchasing on platforms is good, and I think that's what Hector means by uthrow. Free ff tipper uairs, utilts, and wL grabs.
Fthrow i don't really use that much, accept at the edge and getting multiple regrabs at 0% (surprising how often ppl don't DI-- yes I play high level players). Frustration factor lol
Typically grab is best when techchasing on stage, unless you are spaced for a tipper fsmash, reverse up-b, or something that will definitely kill.