Re: Baseboard vs. forced air
With a condensing gas boiler with outdoor reset, they can be very efficient. But the main thing is comfort.
However, efficiency will depend on how hot you need to run your water and that's also dependant on flow rates.
Bottom line, forced air didn't become more common because it's superior, it's more common because it's cheaper more so because central AC is easily integrated to it without needing two independent systems.
For best comfort in a home in 4 seasons, I personally would want radiant floor heat... and possibly cooling too combined with hydronic air handlers to supplement the floor systems.
1925 Two-Story Stucco Beaux Arts Neoclassical