So you want a P99 full size and the trigger choices are AS and QA.
The AS is a double action/single action with a 4.6 lb single action pull and a VERY short VERY nice reset. It is the one I recommend.
The QA is a Glock-like trigger that is half-cocked or uncocked and gives you an 8 lb pull. It is referred to as a DAO but isn't really. If you want a trigger that is consistent shot to shot you will get that with the QA but if you decock the gun will not fire until recocked.
The AS can also give you a consistent trigger shot to shot. Just chamber a round and pull the trigger back to the single action position. The gun will then have the same single action pull on every shot. Alternatively, for carry, you can decock the AS and it will give you an 8lb first shot and 4.6 lb on subsequent shots. This is how most of us on this site carry the AS. You can recock by moving the slide back about 1/4 inch.
This may sound complicated but it is not at all. Get your hands on a P99 AS and you will not want to let go. It is a beautifully crafted gun with great ergonomics. It is a copy of a Glock in that it is striker fired, polymer framed, coated with Tenifer (THE BEST COATING), and very easy to field strip. The gun looks good and feels good and it is James Bond's gun. :>)