Is it easier or more difficult to classify inanimate objects than it is to classify biological organisms?

This have concerned taxonomous (biologists focused on organisms classification) for many many years.

Consider that you have to classify furniture, it's very easy to say if something is a chair, a bed, or a nightstand. Now consider that you have to classify great mammals, it's easy too: lions, leopards, tigers, etc.

But in Biology, we have to tender our knowledge with an evolutionary background, so, we have to say if lions are more related to leopards or are more related to tigers. Even with big organisms it is hard to set up this relationships.

French poodle dogs are a different canine species than german sheperd dogs? No, they are all the same species, Canis lupus familiaris.

Imagine now a microscopic level, where you have to establish relationships among bacteria. Bacteria are very small organisms, comparing structures may not be a clever way to approach this problem, hence, we compare genetic and physiological processes. It's very hard to classify in a "natural way" all the organisms, because not all of them are even similar, fungi and plants couldn't be more different! But we consider both as living things.