I was offered a DCB and Infinia Metal when getting my first HDFC CC, both paid. After a lot of careful analysis, I intentionally chose DCB because of 3 reasons - 1) DCB had 2X rewards on weekend dining at standalone restaurants. That mattered to me a lot. 2) DCB had monthly milestone benefits of Rs 1k vouchers (BMS, OLA etc) on spends of Rs 80k. Again, very handy when I know I have a big spend/purchase coming up 3) DCB waives off 10K annual fees on spends of 5L v/s 10L on Infinia whose annual fees were 12.5k (compensated with 12.5k pts). That exactly matched my annual spends. This is immaterial for you since yours is LTF.
Infinia Metal has a higher daily/monthly reward points limit but if you aren't even maxing out your DCB limit then it is pointless to chase Infinia Metal. Other advantage is better bonus reward points on Gyftr vouchers (5X v/s 3X for DCB). Of course, if bragging rights/status is a factor (it is for some people) then no point in considering the Pros & Cons 🙂