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The specific numbers matter a lot though. If a comprehensive transit system is only 15% of the cost of a stadium, the transit system is a no brainer. In reality, that $150M needs to be more like $100B to be remotely realistic (for context, the 11 station Silver Line extension of the DC Metro deep in the Virginia suburbs cost roughly $7B). Doing some super quick back-of-the-napkin math to extrapolate that cost for 11 stations to the total system size of 98 stations, we arrive at $62B for the whole thing if built from scratch today. That $62B is an understatement though because it ignores that construction costs in DC proper will be higher than for the Silver Line extension that ran in the median of a highway in the suburbs.

With a realistic estimate for the cost of the transit system, the decision making changes completely. It's certainly not a no-brainer anymore.