@Akaza I own a DCB which is LTF. Was offered Infinia, but it wasn't LTF so didn't opt for it. Detailed joining benefits can be found on their website, however the ones I recall are 12.5k RPs which can be used against flight bookings, some prime memberships like Amazon Prime, zomato gold, club marriott, etc.
On top of this, free lounge access and 15-16% RP on vouchers purchase (includes Amazon, flipkart, myntra, pantaloons, titan, max, etc. - over 200 brands). The limits for RP here are 7.5k/month for DCB and 15k/month for Infinia.
Other aspects: you can get upto 3 add-on cards for lounge access. DCB is well Diners international , whereas Infinia is more accepted everywhere (I guess it's visa)