It's the shooter not the bow.
The most accurate longbow I've ever owned was a Samick SLB69.
To look at it was a piece of junk,the grip was so fat I took a rasp to it a couple of times to get it even close to my hand size,and I don't have small hands.
Since I was stupid enough to give that bow away,I've owned a couple of up market longbows an while they shot Ok,they never felt as good or shoot quite as well for me as the old Samick.
I think the main thing that made the Samick so good for me was the fact I owned it 6 years,it was the only bow I owned and I shot it almost every day.
Now days when somebody shows me his latest wonderbow,I don't say much because I know 90% of them will be showing me something different in a year or so.