You have re-opened a can of worms that will never be resolved.
IMNSHO, there isn' t a lick of differance in the effectivness of any of the 1, 1.5, 2 cam bows.
You can now find 1 cams with a larger valley, and soft back wall, and 2 cams with a small valley and hard back wall.
PERSONALLY, I prefer a 1 cam bow with a solid back wall. Why? It works for ME (And I am NEVER happy with my cams being out of time in the SLIGHTEST...just anal...I know they will shoot OK....but I just hate knowing they could be off even a " little" )
There are people who have had GREAT success with ALL variations of the number of cams...and a far greater number who had problems with each style.
Shoot what feels good to YOU and works with your style.
GENERALLY, I find that shooting a trigger release with back tension (as I do) a short valley and hard wall work best.
When shooting a " purebred" Back tension release, a large valley, and soft back wall work better (as these releases need to move a lot more than something like a Chappy Boss).
No back tension, and a trigger....whatever feels good (Though if not shooting " off the wall" a larger valley may be more forgiving)