I know this is subject to opinion, but while trying to remove opinion as much as possible, is there a type of motion or ball that is generally better on your every day ths? I mean in terms of smooth and controllable, hard arc, and skid flip for types of motion and asymmetric cored balls vs symmetrical, core strength and cover strength, ball finish for type of ball. I know that there is no one thing that is always best, I am just curious what would be best to chose if a person went to a new house with no info and could only take one ball. Theoretically of course. And if it helps, this is assuming average revs and speed.

There are so many different things that are variables to really give an answer.

A good benchmark ball is what I want if I go in not knowing the shot.  Something that is going to be predictable and controllable.  Balls like the Sigma Sting, Venom Shock, IQ Tour Solid, and the Melee Cross are all pretty good options in this case.

Whatever will remain continuous and carry the corners as you move in deeper

It all depends on what your eye likes to see.

After watching and studying the BEST local and Pro bowlers on various conditions, I find that heavy forward roll seems to be a common denominator with these higher average bowlers. It seems to be more consistent on all types of lane conditions as opposed to the skid/flip reaction.

If someone can show me a device that would assure this release I would appreciate it very much.
Thank You

Watch what others are using.
See where they are playing.
Watch who is striking.
Make your adjustments from that.

Here is the thing people don't understand about house shots.  The thing that makes them easy is not the margin of error, but the ability to attack them successfully with so many different styles and roll patterns.  Therefore the answer to your original question is that almost any type of roll will yield high scores  if you can repeat the shot with accuracy. 

If you throw a low track spinner or are a low rev guy you just need to get to the dry earlier to get a good reaction.  If you have a lot of hand and need the oil you just move a little deeper and catch the oil later.  Sounds simple, but what makes flat patterns tougher is that you cannot control how soon or late the ball comes off the end of the oil