Sirius 1 had the weird floppy drive and unusal high-res graphics. Apricot had Display-in-keyboard and compact form factors. Olivetti had charming italian design and the strange upside-down motherboard (when battery leaks it drips down instead of eating the PCB, talk about ahead of its time!)
All ran MS-DOS but not "PC compatible", so none of them really took off. Then everyone started to do 100% compatible clones, and it was a race to the bottom.