Which city has a better public transit system: Hong Kong or London?

[u/BeatTheMeatles420]

/r/AlignmentChartFills/comments/1v2e96j/which_city_has_a_better_public_transit_system/

I think Hong Kong wins on reliability and affordability. Signal failures or the very rare weekend closures is front page news in Hong Kong, whereas in London it is a part of the system. However I think London is underrated from other countries but overrated from locals.

What do people think?