Stickman,
I do intend to own one or both rifles after the sunset, and become poficient at the firing range with them. I thought perhaps the A3 might be enhanced by steadier shooting with its longer barrel, and forearm. I imagine the heavier A3 barrel disipates heat better too and might aid in more accurate shooting. I doubt the 1-9 or 1-7 twist barrels will make a difference in one gun or the other with standard 55 gr ammom. However, if there is a disadvantage in one over the other, the 6721 Tactical A3 is about a pound heavier. But it seems you don't think there will be much difference in the two other than personal preference. Well then that's nice to know that they are on even keel and one is not inferior to the other, because I have been working on details to own the two after the sunset. I really don't want to make any major $1,000 mistakes!!! I don't want to appear as I am answering my own questions, as much as I wanted to see if my thoughts were correct.
As far as you saying you don't understand the glamour of owning a marked LE rifle.....it's no different then most guys prefering the 6920 M4 to the 6721 A3 Tactical hands down 4 to 1. I guess everybody wants to associate their toys as close to the real thing as possible. From what I understand, the M4 is the current issue Military rifle with stepped barrel and all, but without the Rock n Roll lever on it. So for a civilian, the LE stamping on either is as "Real as it Gets".
No different then when the FBI adapted the 10mm round. Everbody had to run out and buy one.
Time will tell how the LE stamp effects the value. I think it will especially help its value during the next ban! (Trust me, I don't know when it's coming, but it's coming.)