What phone should I buy for my Mom ?

Hey r/AskIndia ! For the past six years, my mom has been using her Redmi Note 7, but she was never satisfied with it. It was fine for about six months, but then it became horrendously slow and never really recovered. It's become her new normal, but I don't want her to feel that slow and limited again. I want to get her a phone that feels modern and special. I'm considering the Samsung M35 and the Motorola G85. The G85's new curved screen is tempting, but I'm concerned about its processing power. An OLED display and a flawless user experience are really important to me. Any advice would be greatly appreciated! Thanks! P.S. My range is strictly below 20K, preferably 15 to 18K