... I prefer the recent versions with the finely hand-painted "dials", since the Earth features stand out so much clearer and finer than on the enamel disks.
When I started my preoccupation with UN's astronomical timepieces, I immediately considered the Tellurium the most practial of the Trilogy, and wanted to wear that one. Only later, after many discussions with Ludwig Oechslin and Rold Schnyder, I came to the conclusion that the the Planetarium is the more historical and philosophical timepiece.
Marcus