Is nikon z a good system to buy into?

Here is what the site says about that.

From Nikon D750: Nikon D750: A DSLR by Nikon with a 24.3-megapixel full frame sensor, announced in 2014. Old, but a classic used full-frame buy.

From OM System OM-1: OM System OM-1: A mirrorless camera by OM System with a 20.4-megapixel Micro Four Thirds sensor, announced in 2022. The first OM System flagship: a stacked sensor in a weather-sealed body.

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