You’ll get a few opinions here for sure. Nothing has potential to grow at a pretty quick rate. For me, OnePlus was growing faster until they hit about the 8 series, where things started to not change as much. This might be a chance Nothing needs to propel ahead when comparing these 2.
There’s also the fact tho that currently the Nothing Phone doesn’t work in the US, whereas OnePlus does so that’ll definitely work on OnePlus growth over Nothing.