With a high-profile implant, the liquid volume is the same as a standard implant but its diameter (footprint) is narrower and the projection (the amount it protrudes out and away from your body) is greater.
Most women are better candidates for standard implants. If the diameter of the implant size (standard implant) you selected is about the same as, or smaller than, your measured breast diameter, then a standard implant is your best choice. If the diameter of the desired breast implant size is larger than your breast diameter, then a high-profile breast implant is best.