From the factory, Ford uses rubber bushings throughout the Mustang's suspension. While rubber bushings aren't the best option from a performance standpoint, they do help keep the cost down and provide a smoother ride by controlling what's called NVH (Noise, Vibration, and Harshness). Keep in mind a large number of Mustang owners never even really modify their car, so Ford's use of rubber bushings makes sense in that regard. Since rubber bushings suffer on the performance side, they're a contributor to wheel hop.
If handling and eliminating wheel hop is a priority, then replacement bushings are the answer. While there are a few different types of materials available, the most commonly used option is polyurethane. Polyurethane bushings will provide a much firmer feel than the factory rubber pieces and, when properly maintained, will outlast the stock components. While they're not the stiffest bushings manufactured, they're an ample upgrade from the factory rubber. They give slightly more NVH than rubber bushings, and they do need to be greased every few months, however. These are fantastic for a daily driver.
Spherical Bushings: a better type of bushing than poly, they are fantastic for drag launches and perform quite well in all applications. Their main drawback is simply the amount of increased NVH, primarily the noise. For a daily driver they are not the most optimal. The noise tends to get quite irritating. That being said, many do it without complaints.
Aluminum: similar to poly bushings in that they are great all-arounders. They're stiffer than poly bushings however and have a little more NVH. While it takes a little bit of time, they are susceptible to corroding as well. If you're a road racer though, they can withstand much higher temperatures than rival bushings, fantastic for when the rear end generates a lot of heat.
S550 IRS bushings are crucial for 2015 Mustang owners who want to drag race their Mustang as they take a lot of slack/slop and play out of the suspension. The stock bushings can allow rear subframe movement that can absolutely ruin a quarter mile time. IRS bushings help the S550’s rear feel more solid and planted, especially when taking off from the line.