Should I Opt For Bilateral Or Total Knee Replacement?

My mother is suffering from arthiritis since last 5 yeras and she is undergoing treatment under Dr Kaustab Chakraborty(joint pain specialist ,peerless)kolkata.He had suggested for bilateral knee replacement to get rid of pain as both the kness are damaged.He had suggested for Dr p.K BANERJEE (peerless)for Total knee replacement .Kindly advice for best doctor and Hospital at kolkata for undergoing Bilateral knee replacement .Few persons are recomending Dr Santosh Kumar (Momentum Knee clinic).