With the standard you are up against a system, not each other. Percentile One of the division points between 100 equal-sized pieces of the population when the population is arranged in numerical order. The percentile is transformed from a raw score. These are linear transformations. As one side changes the other changes in equal proportions.
Percentiles are great at a descriptive level.
Standard Scores are linear transformations. Raw scores are transformed into standard scores. The Z score tells you how far the raw score is away from the mean in terms of standard deviation units. Raw score does not change into a bell shaped curve when changed into standard scores. The numbers do not change physically, the measurement just changes.