[amtrak-official]

Ranking Metros based off when I remember them

1. The Chicago L
2. The T
3. DC Metro
4. New York Subway
5. La Metro
6. BART
7. MARTA
8. SEPTA
9. Metrolink
10. PATH
11. Metro Rail
12. RTD
13. RTA (Cleveland)
14. Skyline(honolulu)
15. Vancouver Skytrain
16. Toronto Subway

[amtrak-official]

This has nothing to do with quality and everything to do with memorability and the T is memorable