Upgrade Millenia LTF to Regalia gold? Also have SBI cashback card

I am being offered Regalia Gold LTF(have to confirm via mail) upgrade from Millenia LTF. Millenia had amazing cashback, but since I have SBI cashback card too, offering similar or even better cashback, should I take this upgrade? Other cards are Amex plat travel and Tataneu infinity Kindly guide guys