BCL is much more solid and accurate, also more aftermarket support.
And according to my cheap reloads,way more accurate.
SU is light and cheap. The after market pistol grip is cobbled together with bolts and the handguard is wobbly.
Accuracy is around 2 -3 MOA with factory match ammo.
I know the BCL has a couple of issues but so do the SU.
It’s really not fair comparing two completely different price guns.
If you don’t mind the look and feel of the SU , by all means , get one.
The warranty will cover the original owner in case a rear blowout.
It has the best stocktrigger you’ll ever find on a cheap semi.I don’t know if it’s been resolved but I do recall a few incidents after they said it was resolved.