Flow Formed wheels

Weight
Wheel weight is the most popular topic when people talk about aftermarket wheels. Mass of the wheels contribute to unsprung weight on a car. For those who don't know, unsprung weight refers to car parts weight below vehicle suspension including wheel, tires, and brakes. As the unsprung weight can heavily affect how the vehicle feels and handles. The lighter the unsprung weight, the better the car handles. Weight reduction is a main goal when it comes to performance wheels.
Aftermarket cast wheels can generally be lighter than OE wheels depending on style and sizes. However to combat the material irregularity in the casting aluminum, manufacturers often have to add redundant material to spokes and barrels to increase its strength, thus becoming heavy.
Flow formed wheels being the latest technology combining cast and forge manufacturing techniques together, they are much lighter compared to cast wheels. With the face/spokes being the same as a cast wheel, the barrel is rolled out with heat and pressure. Therefore the barrel poses a forged-like strength which in return reduces its thickness and reduces overall wheel weight.
A fully forged UTV wheels is the lightest among them all, it's generally 25-30% lighter compared to a cast wheel in the same size. The forged 6061-T6 aluminum has very good mechanical strength, manufacturers are able to use a lot less material to achieve the same strength compared to a cast or rotary formed wheels. Therefore many forged wheels have slimer spoke designs and have weight reduction pockets cut into the back, which further reduces its weight.

Strength
Regardless of what type of manufacturing methods are used to make wheels, all wheels need to undergo physical or computer simulation tests to make sure they meet all applicable regulations and safety standards. However, the difference in material shows if there is an impact to the wheel. Under heavy impact, cast wheels tend to crack and break due to voids presented in the casting aluminum. In most situations it would be fine, but if the wheel snapped, the result can be catastrophic. So when buying cast wheels, it is always recommended to choose a reputable brand because of safety concerns. Rotary wheel barrels are stronger than cast wheels, however due the spokes being the same as cast wheels, a similar cracking and breaking situation would happen under heavy impact. Fully forged wheels are the strongest in theory, however because manufacturers use less material to achieve the same strength as all others, it will take the same amount of force and loading. The difference is that under impact, the forged aluminum will bend out of shape instead of snapping to allow for sufficient time for the driver to stop the car safely.

Performance
Performance of the wheel affects how a car handles and feels, and it is largely due to the weight of the wheels like mentioned before. “Unsprung Weight/Mass" commonly refers to weight of all car parts that are below suspension such as brakes, wheels and tires. It affects how quickly a car can turn, accelerate and turn. Therefore, a low unsprung weight will improve a vehicle's handling and performance. Forged UTV wheels being the lightest of them all brings the driver the most significant improvement, followed by rotary formed wheels, then cast wheels. In addition, because of the material strength and rigidity used to produce forged wheels, they provide better lateral support to the vehicle when taking corners under high speeds, as well as providing excellent feedback from the road surface.

Appearance
Because the casting process involves a casting and a de-molding process, in order to produce parts without defects, many manufacturers choose simplified designs to make sure molten aluminum can reach every corner of the mold and can be easily taken out of the mold after cooling down. As a result, cast wheels are often plain and rounded on the design with painted finish to cover any surface imperfection. Rotary formed wheels are similar to the cast wheels, however often they go through a simple machining process to add additional features and elements. Forged wheels often have complex designs thanks to modern precision machining techniques. Starting from a solid chunk of forging, a high-precision CNC machine is capable of carving out the smallest surface detail that the designer envisioned. With hand-applied premium finishes such as brushed or polished finish. Forged UTV wheels are often considered as a precision art piece that can greatly accentuate a car.