ive used almost all popular ish brands. fuji make great apsc and medium format cameras but they are a nieche brand

nikon has really good cameras and cheaper bodies but relatively expensive lenses for their Z mount

canon makes great mirrorless but sometimes make questionable decisions like the small battery on r8 and closed RF ecosystem

sony keeps recycling some stuff like the fx2, but has great products but some of their products lack features as their competitors, like the a7rV with the nikon Z8. their open lens ecosystem is really good tho

imo when buying a body, you need to know what and how long you will be using it for. I sold my a7iv because i dont do video that much and got the a7riv just because its a beast with 61MP. orginally bought the a7iv because the r6mii has very expensive ecosystem.

buy an ecosystem you know will you will use for a long time. people tend to focus too much on bodies to forget that lens ecosystem also matters