I'm sure you posted it somewhere, but I don't want to search it out. Nutshell it.
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OK - I previously typed this before. I just copied and pasted it - with a few updates:
1. I like the sight picture of a standard type 92 slide the most, which the M9A3 also has. The squareness of the front sight area on the Brigadier slides makes the front sight not as quick to pick up. The base where the front sight sits at is squared off on the Brig slide. It doesn't have that curve on it like a normal 92 does around the front sight area.
Also, the front sight IS a little bit shorter on the Brig slide.
I think it is much easier to see the front sight on a standard 92FS slide, with the curved area under the front sight... (this is 1 thing I like about a 1911 - the top of the slide is curved, and it makes it so quick to pick up the front sight). On this M9A3, the Vertec style slide (dovetailed front sight) still has the curve of a regular 92FS. I like this much more.
2. Also, the front sight (facing the shooter) on the M9A3 has about a 45 degree cut to it. The Wilson front sight has a 90 degree cut (shadows effect seeing that white paint more). The white circle around the tritium on the M9A3 pops out more - because of the 45 degree angle facing the shooter. It picks up more light since it's at a 45 degree angle.
3. I REALLY like the different angle of the safety levers on the m9A3. By raising it upwards a bit, it does cause less issues when tying to clear a jam (if need be). I've messed around with this, and the levers do what is intended by that slight change
4. The grip of the M9A3 feels better to me. Generally, I prefer standard serrations over the checkering Beretta uses. But, with the rear strap being covered by that Hogue grip on the M9A3 - I don't mind the front strap checkering.
When I hold both guns (either with a loaded mag in each or no mag in each), I prefer the feel of the M9A3 in my hand more than I do the Wilson. Granted, I do NOW have Hogue grip panels instead of the VZ grips on the Wilson (I like them better than the stock VZ's)... But, the M9A3 feels much better to me in the hand.
5. The rear sight of the M9A3 is just perfect. I didn't think I'd like the lack of white circles on the rear tritium. But the silver rings work great around the rear tritium on the M9A3. The eyes still gets drawn to the white around the front dot - but you still have 2 rear dots.
I'd never use the Wilson with the all black rear sight as a home defense gun - as you have absolutely no way to see the rear sight in low/no light. Granted, I have solved that problem by having Trijicon replace that rear Wilson sight with a normal tritium rear. But, as I am talking about the Brig Tactical and how it comes FROM the factory with the all black rear... The M9A3 wins this IMHO. It's too bad the Wilson sight doesn't come with a single tritium rear dot - like Straight 8 sights.
Also, I wish the rear Wilson sight had a square cut instead of a curved cut (in the sight channel). I just don't like it. Again, this was solved by me having Trijicon replace that rear sight on the Brig Tactical.
6. I shoot the M9A3 a little better than I do the Wilson with the factory sight - especially at 15 yards. I think this may because of that rear sight - with the curve in the sight picture.
Now, do I like the Wilson - yes. But if I was offered a choice of just 1 of them... Between the 2.... I'd choose the M9A3, hands down... No real hard decision for me...