I don't think it makes much difference, although the more you play a game, the more familiar it becomes, so there is a small chance of predicting some moves or results, but there is no guarantee that you will win just by playing a game a lot. Variety is always a good option, I think the maxim of “don't put all your eggs in one basket” fits well with this too.
Your motto is a note to investors, it is not a direction in gambling because in investing we can also by some figures to be able to predict a certain percentage of return but it is rare to achieve this in gambling when there is no clear figure to support it, all is a smoke covering and forcing to go in to know the result. More variety in gambling only adds to the confusion and inability to find the right path, one game is more than enough to satisfy basic needs, adding more only complicates the gambling process