Answer

SSB vs VSB

SSB: Suppress carrier + one sideband. BW = $f_m$. Generation via sharp filter or phase shift (Hilbert). Coherent detection. Saves 50% BW and power. Need sharp filter, carrier reinserted.

VSB: One sideband fully + vestige of other. BW = $f_m+f_v$ (TV: $f_v\approx0.25$ MHz). VSB filter gradual. Used for TV video (SSB filter too sharp for 4.2 MHz video).

	SSB	VSB
BW	$f_m$	$f_m+f_v$
Filter	Very sharp	Gradual
Complexity	High	Moderate
Use	Telephony	TV

Final: SSB max saving, VSB practical for wideband.