>>4148058Z6 is a great choice if used, Nikons are very reliable
I'd never buy a new Nikon (battery weaker than Sony's, A7III last three days of intensive shooting, Nikon will last half a day) and I'd never buy a used Sony (weak shutter, weak IBIS mount)
btw
>>4148054Used R6 is a great choice. They are pretty reliable if you don't get errors (electronics is the weakest part of R5/R6)
New R6 is also lags behind Sony, just because of weaker (but still good) sensor. Though, even if it have weaker dynamic range, ISO perfomance is really solid on R6
Z6 have better sensor, R6 have better AF, battery and so on
What I hate about R6 is the ugly design