Handling
With their similar turning circles, the Lexus SC 430 and the Boxster definitely handle almost the same into and out of tight spots.
Drivetrain
The SC 430's engine is considerably bigger than the Porsche Boxster's. Note that more massive engines may use more gasoline than smaller ones.
The Lexus packs quite a punch compared to the Porsche Boxster with respect to torque, which is the force that lets you accelerate quickly.
Torque is the force that lets you accelerate quickly, and in this respect, the Lexus is considerably more powerful than the Porsche Boxster.
Utility
The Lexus SC 430 will most definitely prove handier than the Porsche Boxster for those of you with frequent kid-cargo.
Comfort
Taller drivers will substantially enjoy the extra head room in the Porsche Boxster's front cabin compared to the Lexus SC 430.
Dimensions
The Lexus SC 430 is tremendously more bulky than the Porsche Boxster.
Your wallet will hurt more every time you fill up the Lexus than the Porsche Boxster because of its larger tank.
The Boxster and the Lexus SC 430 compete for the same parking spaces.
The Porsche Boxster's shorter wheelbase will likely give a sprier feel in daily traffic. On the other hand, the Lexus SC 430 is likely to have a smoother, more stable ride.
Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs about the same to get the SC 430 to the dealership as the Porsche Boxster.
With respect to MSRP, the Porsche Boxster costs considerably less than the Lexus SC 430.
Warranty
The Lexus SC 430 and the Porsche Boxster have the same basic after-sale protection.