The others seem to be assuming you are an advantage player. Although you use some inside terminology, you also say some other things that lead me to doubt this. This is not to put you down in any way, it's just that I've learned most new posters don't have the background we tend to assume.

The fact is you should be confused. There is no magic formula like "1 deck is best." If it were that easy, everyone would do it, and the casinos would go out of business. 1 deck is best for SOME players at SOME casinos that have certain rules, penetration, etc. The devil is in the details.

To get UNconfused, you need to read several technical books (like those in the catalog here). To actually win in the long term, you also have to memorize some stuff, and practice like one possessed.

For example, can you tell us what system you use, and what count at which you would stand with hard 15 v T?

Good luck,
ETF