The salient difference is that metros (subways) are grade-separated. Metro = 100% grade separated. Most effecient (moves greatest number of people quickly) and most expensive because of tunnelling. Heavy-rail = may have grade crossings (esp., US), no mixed traffic.
Family plans share a similar story between the two companies. Four lines of unlimited data cost $140 on Metro and $160 on T-Mobile. In this case, the difference is somewhat limited. Families that want unlimited data with no deprioritization should consider T-Mobile the better family plan option.
Status Update. Delhi Meerut RRTS (RapidX) project’s Priority Corridor (Sahibabad – Duhai) with 4 stations was inaugurated on October 20, 2023. It was opened to passengers for commercial operations on October 21, 2023. In December 2023, NCRTC started trial runs (train testing) on a 24.8 km route between Duhai – Muradnagar – Modinagar
METRO bus rapid transit (BRT) ridership stayed strong during the pandemic and is recovering faster than other service types, reflecting a rising demand for all-day, all-purpose service. BRT ridership increased 43% (3.36 million rides) from 2021 to 2022. Rides on the new D Line, which largely replaced Route 5, went up more than 50% from December W0Qi.