Why did I change and go boiler?
Lucked into a plug-n-play 1959 AA for a very good price.
Having the ability/skills and tools plays in big part too.
But, it helps to have unlimited hot water at a good savings, along w/ the ability to extend or branch out the system in any direction and for any distance easily w/ only 2 little pipes or pex tubes.
I added a hot water coil into the furnace plenum and piped 2 other zones w/ a 4th zone spare...for now.
I also gained an auger and the ability to work off a large coal bin.
Duct work is not as versatile.
Oh, I still have my whole house A/C