Boils down to personal preference. All those brands you mentioned are decent I think. I own one of each and I prefer my DPMS but I bought it used with upgrades already installed. The rest of my ARs are just factory stock.
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I have a ruger. It is a very nice rifle. And for how cheap they are I just can't see them being beat. Very happy I picked one up. I was able to get it and add everything I wasted to and it was still cheaper than a bushmaster and spikes. And many of the others.