Which is better in the long run, IIFT Delhi or any new or baby IIM?

IIFT Delhi is way better than even New IIMs, let alone Baby IIMs. If you need evidence, you can look at how although IIM Shillong and other new IIMs were opened about 10–15 years ago, none of them are even close to IIFT Delhi’s ranking (I suggest you check genuine rankings like Inside IIM, Career Launcher and T.I.M.E). IIFT Delhi can only be compared to IIM Kozhikode and IIM Indore.