Ive hunted whitetail and mule deer with 16" and 20" ARs.
My current and favorite hunting setup is a 20" CHF PSA barrel with a shaved pinned FSB under a 15" ALG rail, on a A5 lower with ALG ACT trigger, and a Redfield 2-7x33.
I much prefer the 20" because its way easier on the ears (your hunting party will appreciate it more than a 16") and that tiny bit of extra velocity helps the already barely adequate (for four legged beasts anyway) .223.
Also, the rifle gas length has more desirable recoil characteristics, its easier for me to keep the animal in the glass on running shots than with 16" guns.
Of the rifles OP listed, Id go with the Daniel Defense 18" with the rifle length gas.
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