I am quite familiar with all three.
1) Klipschorns
2) Cornwalls
3) Distant third - Advents
The Khorns are amazing if you have the correct room for them, but the Cornwalls are a really enjoyable all-arounder, and an easier fit in more rooms if less exciting dynamically. They're still superior dynamically to the average good direct radiator.
In my opinion, the Advents are just too old, and I don't think they are really even in the same league as the other two.
1) Klipschorns
2) Cornwalls
3) Distant third - Advents
The Khorns are amazing if you have the correct room for them, but the Cornwalls are a really enjoyable all-arounder, and an easier fit in more rooms if less exciting dynamically. They're still superior dynamically to the average good direct radiator.
In my opinion, the Advents are just too old, and I don't think they are really even in the same league as the other two.