Ok dude, here is my take on different parameters but I am splitting hairs here ok?
a) Customer friendly, both are nearly equal...lets say 3.5 (Airtel) and 4 (TPBB)
b) Quality of network including their trunk bandwidth - Equal, these guys are the bees knees when it comes to level 1 ISPs. Jio not experienced yet so I wont comment
c) Flexibility - TPBB 4, Airtel 4.5 for the simple reason I get a public IPv4 (paid) AND a public IPv6. TPBB is CGNAT v4 and public v6 but they offer a static /64 on v6 for FREE if that's your thing and makes you happy.
d) Customer Support - While ISPs and telecom providers mostly have dorks at the call centres I think TPBB is better here. 4 for TPBB and 3.5 for Airtel.
e) Repair times and downtime - Airtel 4 and TPBB 4.5. These guys are good. Keep in mind fibre cuts are not in their control but repair and remediation are.
So, you can't go wrong with either of them. Both have minor pluses and minuses over each other. It's honestly your call.