Oregon seems to be a lot pricier than Greenworks. Can't say if that's generally true, but I looked at 16" chainsaws with 40V / 4 Ah battery & charger on Amazon.
$187 for the Greenworks model,
compared to
$350 for the Oregon model
Both use brushless motors. The Oregon model claims to do 400 cuts on a single charge, vs. 100 for the Greenworks.