It really depends. Old hot water radiators were ugly in their own way. Even with modern forced air HVAC I find the soffits and boxes to accommodate ductwork unsightly.
this is why I went with LG ceiling mounted cassettes. IMO it's even better than floor vents (they stay cleaner, floors are easier to clean) or ducted ceiling vents (each cassette can target the air movement direction actively toward humans).
and all the electronic bits are in the attic so the noise is a little better.
