Depends on what you want to use it for. Bushmasters come with a chrome-lined barrel,and a chamber designed for 5.56x45mm.Armalite barrels are unlined and I believe they are chambered for .223, which uses a cartridge case of a slightly smaller diameter. You can shoot either cartridge in both rifles, but the Armalite will be slightly more acurate because an unlined barrel is usually more acurate, and the tighter chamber will cause less slop. The Bushmaster will be more reliable(less failures to feed/extract) and the barrel should last longer. I have a Bushmaster and it's great! Very acurate, very fun. I plink. If shrinking your hundred yard groups from 1.5 inches or less by 20% or 30% is a big deal to you, then get a target model.Bushmaster, Armalite, whatever. My dissipator was afordable and has been very reliable. Plus, I can afford to shoot it more by taking advantage of the good deals available on quality military surplus ammo!!Just my 2 cents.