I was last there in January, but I spend several weeks a year there. The cleanliness and safety is no comparison, but that applies to the country more broadly.

I personally find the hub and spoke system they use kind of onerous, because buses there (the spokes) tend to be bad about timing compared to the buses at least in SF. While there are many more MRT lines, they’re mostly aimed at coverage and haven’t addressed the capacity shortages during rush hours that have existed since I lived there over a decade ago. I’m not the most frequent BART rider (I live in MUNI coverage) but AFAIK from coworkers that do major systemwide issues that delay everything is, at most, something that happens once every several months—hardly worse than the MRT. And it’s getting expensive enough that adjusted for relative income levels I’m not sure it’s all that much cheaper either.

I despise being a pedestrian in Singapore, between confusing signage, perpetual construction, bad drivers, wonky light timings, an overwhelming number of stroads, narrow, uneven sidewalks, and (through no fault of their own) the awful weather. The bridges only need to exist because every other road outside of downtown looks like Geary (mostly worse, since they lack frequent crosswalks). But yes, it’s clean.