I've owned the American, axis & and the Zastava in 6.5x55 and a 375 h&h. The Axis and Americans have their advantages - mainly being lighter.
The Zastava seems much better built, heavier, all steel floor plate, follower, etc. proper blueing, very good adjustable trigger. The action is based on the FB 98 variant so aftermarket parts are interchangeable. I have found them to be very accurate as well.
I have also owned a few surplus Husqvarna rifles like the 1640 and prefer the Zastava. The stocks are stronger and don't tend to crack as often. The trigger is also way better.