Just in case anyone is interested, here’s the (manufacturers) weight for each:
SRAM NX PG1130 11-42T £63 – 538g
Shimano XT M8000 11-42T £66 – 434g
Sunrace MX8 11-42T £57 – 419g
I’ve also got the Sunrace 11-42t on 2 bikes, 10 and 11 speed and they have been faultless. I was quite surprised the XT one was heavier.