There is a reason the Baer system is heavier than the Wilwood system. The Baer rotors are thicker for better durability and heat dissipation than the Wilwood rotors. They can withstand more heat cycles. You need to fully understand the workings of the entire brake system before you just look at one aspect such as weight. If that were the case, companies such as GM an Ford would just go with the lightest rotors possible on cars such as the Corvette. However, they need to think about other features of the entire system, also.
The one-piece rotor is the most common rotor type. The two-piece rotor is more of a cosmetic upgrade. It was originally designed for racers who needed to change the rotors due to wear on the race track. The two-piece rotor allowed them to keep the same hat section and bolt on a new outer rotor. For street cars, it is mostly cosmetic. The hat section on a two-piece rotor is aluminum as opposed to cast iron on a one-piece rotor.
Hope this helps.
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