Hmmmm, I normally shoot my own reloads out of all my 1911's but I also have both the Federal American Eagle and Winchester ammunition mentioned in the OP. Accuracy for me is pretty much equal and see no discernible difference there. I do however find that the AE is about 40-50 fps faster than the Winchester - at least the lots that I have. On the boxes I have, Federal AE states 890fps and the Winchester states 835fps. which I have found to be true by chronographing them both out of standard length 1911 barrels. Not only have I verified the AE is faster round, the recoil is also slightly more and can be felt when shooting. In fact I normally never carry a 1911 but once in a while I will go to the Range and will use the 1911 as a carry gun for that day - then I remember why I don't carry a 1911 - lol. I load the Federal AE 230 grain FMJ because I do find it a bit faster and I usually do not have any HP ammo in stock for the 1911's as I almost never carry one. With a 230 grain ball round I am not at all concerned that it will not expand.
In my experience usually a slower round of the same exact weight and configuration "should be" slightly more accurate so I would think the Winchester round would win in that category. That said, in practical testing I find little to no difference out of my 1911's.
If the velocity of the Federal AE rounds you tested is actually 833, I'd say either Federal has changed the spec's or that particular box or lot was not loaded correctly. Again, in my experience the AE has always been 5% faster but the lots I have are at least 8 years old now.