Siva, all of the interventions you mention are potentially appropriate. The ideal or even preferred hearing system depends on many things, cause/duration/onset of sshl, the economics, patient preference and hearing needs, supply. Each is worthy of an essay.
It depends Cros hearing aid helps the users to localize sound better and it is non invasive as BAHA needs operation however the deep stimulation provides better localization of sound. Cochlear Implant recently got FDA for single side deafness and it seems better than other options typically if it is done when the hearing loss is recently occurred.
CI would not be an ideal choice. for real binaural experience the inputs to both ears need to be synchronized and CI changes the frequency spectrum of input signal. so binaural benefit is still not proved in those cases.
BAHA and CROS would ideal do lot of good in those cases, i think