Congratulations for getting the offer! It is really a privileged position to be able to chose.
Before I tell you my opinion on this, I think contextualizing my situation would help. I am also from India and I obtained my PhD from a 'Tier1' university in North America about 3 years ago. I was lucky to get a faculty position straight out of my PhD in a top 20 university in the world. I have eventually moved on to a good European university (not top 100).
In my opinion, a post-doc is a great option to elevate your research profile. I would consider it as the ideal option if there was not a faculty position it was getting compared to. The logic behind this is that a postdoc is a contract position and brings with it uncertainties. For example, there is seems to be general consensus that a recession will follow the current pandemic. So, in a year or two are you certain that there will be faculty positions or postdocs on offer?
Further with regards to the 'tier' of the university, I would not place too much importance on it. As Buffy has pointed out, rankings are not an all encompassing metric. Even though I do not publish as many papers now compared to before, I do have much better work-life balance. I am less stressed and I invest more efforts into my students and classes. All of these are benefits which an get obfuscated by university rankings.
Again, take my advice with a grain of salt. I have made my positionality clear. Having never been a postdoc myself, I am sure there are dimensions associated with it I cannot fully comprehend.